Visitor logs would be the best additional method for identifying individuals who enter the building in the event of a camera system failure. Visitor logs track who enters and exits a secured facility, providing a record that can be cross-referenced with security events, like the discovery of a suspicious flash drive. In this case, reviewing the visitor logs could help identify the vendor representative who dropped the flash drive.

Reference: https://www.internetsociety.org/deploy360/tls/basics/
An advanced persistent threat (APT) is a type of cyberattack that involves a stealthy and continuous process of compromising and exploiting a target system or network. An APT typically has a specific goal or objective, such as stealing sensitive data, disrupting operations, or sabotaging infrastructure. An APT can use various techniques to evade detection and maintain persistence, such as encryption, proxy servers, malware, etc. The scenario described in the question matches the characteristics of an APT. References: https://www.cisco.com/c
/en/us/products/security/what-is-apt.html https://www.imperva.com/learn/application-security/advanced- persistent-threat-apt/

Data masking obscures sensitive data displayed on screens, such as masking certain characters (e.g., showing *** for parts of SSNs).
It allows legitimate use while protecting the data from being misused or stolen. Encryption is unrelated because it protects data in transit or at rest but does not address how it is displayed.
Tokenization replaces data with a token but is more relevant for storage and transactional systems, not screen data.
Scrubbing refers to cleansing datasets but does not address this scenario.

WAP A: No issue found. The WAP A is configured correctly and meets the requirements.
PC A = Enable host-based firewall to block all traffic
This option will turn off the host-based firewall and allow all traffic to pass through. This will comply with the requirement and also improve the connectivity of PC A to other devices on the network. However, this option will also reduce the security of PC A and make it more vulnerable to attacks. Therefore, it is recommended to use other security measures, such as antivirus, encryption, and password complexity, to protect PC A from potential threats.
Laptop A: Patch management
This option will install the updates that are available for Laptop A and ensure that it has the most recent security patches and bug fixes. This will comply with the requirement and also improve the performance and stability of Laptop A. However, this option may also require a reboot of Laptop A and some downtime during the update process. Therefore, it is recommended to backup any important data and close any open applications before applying the updates.
Switch A: No issue found. The Switch A is configured correctly and meets the requirements.
Switch B: No issue found. The Switch B is configured correctly and meets the requirements.
Laptop B: Disable unneeded services
This option will stop and disable the telnet service that is using port 23 on Laptop B. Telnet is a cleartext service that transmits data in plain text over the network, which exposes it to eavesdropping, interception, and modification by attackers. By disabling the telnet service, you will comply with the requirement and also improve the security of Laptop B. However, this option may also affect the functionality of Laptop B if it needs to use telnet for remote administration or other purposes. Therefore, it is recommended to use a secure alternative to telnet, such as SSH or HTTPS, that encrypts the data in transit.
PC B: Enable disk encryption
This option will encrypt the HDD of PC B using a tool such as BitLocker or VeraCrypt. Disk encryption is a technique that protects data at rest by converting it into an unreadable format that can only be decrypted with a valid key or password. By enabling disk encryption, you will comply with the requirement and also improve the confidentiality and integrity of PC B's data. However, this option may also affect the performance and usability of PC B, as it requires additional processing time and user authentication to access the encrypted data. Therefore, it is recommended to backup any important data and choose a strong key or password before encrypting the disk.
PC C: Disable unneeded services
This option will stop and disable the SSH daemon that is using port 22 on PC C. SSH is a secure service that allows remote access and command execution over an encrypted channel. However, port 22 is the default and well-known port for SSH, which makes it a common target for brute-force attacks and port scanning. By disabling the SSH daemon on port 22, you will comply with the requirement and also improve the security of PC C. However, this option may also affect the functionality of PC C if it needs to use SSH for remote administration or other purposes. Therefore, it is recommended to enable the SSH daemon on a different port, such as 4022, by editing the configuration file using the following command:
sudo nano /etc/ssh/sshd_config
Server A. Need to select the following:

C). Autoscaling: This is important to ensure high availability and resiliency of the web-based application. By using autoscaling, additional resources can be automatically allocated to handle spikes in traffic or when the application is running at or near capacity.
D). WAF: This is important for protecting the application against DoS and DDoS attacks. A Web Application Firewall (WAF) can help detect and block malicious traffic and attacks on the application.
E). CDN: This is important for improving the performance and availability of the application. By using a Content Delivery Network (CDN), content can be delivered from a distributed network of servers, reducing latency and improving the user experience.