The first step that the organization should take to ensure that only the corporate network is used for downloading business data is to include a statement in its security policy about Internet use. A security policy is a document that defines the rules, expectations, and overall approach that an organization uses to maintain the confidentiality, integrity, and availability of its data1. A security policy should clearly state the acceptable and unacceptable use of Internet resources, such as personalaccounts with ISPs, and the consequences of violating the policy. A security policy also helps to guide the implementation of technical controls, such as proxy servers, firewalls, or monitoring tools, that can enforce the policy and prevent or detect unauthorized Internet access.
The other options are not the first step that the organization should take, but rather subsequent or complementary steps that depend on the security policy. Using a proxy server to filter out Internet sites that should not be accessed is a technical control that can help implement the security policy, but it does not address the root cause of why users are using personal accounts with ISPs. Keeping a manual log of Internet access is a monitoring technique that can help audit the compliance with the security policy, but it does not prevent or deter users from using personal accounts with ISPs. Monitoring remote access activities is another monitoring technique that can help detect unauthorized Internet access, but it does not specify what constitutes unauthorized access or how to respond to it.
References:
ISACA CISA Review Manual 27th Edition (2019), page 247
What is a Security Policy? Definition, Elements, and Examples - Varonis1

Support should be given the greatest consideration when implementing the use of an open-source product, as open-source software may not have the same level of technical support, maintenance, and updates as proprietary software1. Open-source software users may have to rely on the community of developers and users, online forums, or third-party vendors for support, which may not be timely, reliable, or consistent2. Therefore, before implementing an open-source product, users should evaluate the availability and quality of support options, such as documentation, forums, mailing lists, bug trackers, chat channels, etc.3

Comprehensive and Detailed Explanation:
The greatest risk to laptop computers is data exposure in case of theft or loss. The most effective safeguard is full disk encryption, which ensures that even if the device is stolen, data remains unreadable without the encryption key.
* Disabled USB ports (A): Prevents some forms of data exfiltration but does not protect stored data.
* MFA (C): Protects user authentication but not the data if the disk is removed.
* Passkey phrases (D): Improves authentication strength but is weaker than encryption for data protection.
# ISACA Reference: CISA Review Manual 27th Edition, Domain 5 (Protection of Information Assets), section on endpoint security and encryption controls.

Admin accounts typically have the highest level of privileges and access to sensitive data. If the passwords for these accounts are not set to expire, it increases the risk of unauthorized access and potential security breaches. This is especially true if an admin's credentials are compromised, as the attacker could have ongoing access to critical systems and data1.
References:
Database Auditing - Satori