The approach that will allow you to configure individual policies for each application when configuring Endpoint Compliance Settings for Applications and Gateways within Mobile Access is Very Advanced Approach. This approach lets you define compliance rules for each application separately and assign different actions for each rule. You can also create custom messages and notifications for each application. The other approaches are either less granular or not applicable in this scenario. The Basic Approach lets you define compliance rules for all applications globally and assign a single action for all rules. The Medium Approach lets you define compliance rules for all applications globally and assign different actions for each rule. The Strong Approach is not a valid option for Endpoint Compliance Settings. Reference: [Endpoint Compliance Settings]

The component of R81 Management that is used for indexing is SOLR. SOLR is an open-source enterprise search platform that provides fast and scalable indexing and searching capabilities. SOLR is used by SmartConsole to index the objects and rules in the security policy, as well as the logs and events in SmartLog and SmartEvent. SOLR enables quick and easy access to the relevant information in the management database. Reference: Check Point Security Expert R81 Course, SOLR Troubleshooting

The Full Log tracking option includes more information than the Log tracking option, such as the data type of the traffic. The data type indicates the type of content that was transferred, such as text, image, video, or audio. The data type can be used for filtering and reporting purposes. The Log tracking option only includes basic information, such as source, destination, service, action, and time.

To deploy a TE250X Check Point appliance just for email traffic and in-line mode without a Check Point Security Gateway, you can utilize Check Point Cloud Services. In this scenario, you can leverage cloud-based email security services provided by Check Point without the need for an on-premises Security Gateway.
Option C correctly states that you can use only Check Point Cloud Services for this scenario, making it the verified answer.

SecureXL templates are a mechanism to accelerate the rate of connection establishment by grouping connections that match a particular service and whose sole differentiating element is the source port. SecureXL templates enable even the very first packets of a TCP handshake to be accelerated, without waiting for the Firewall kernel to create a connection entry. The first packets of the first connection on the same service will be forwarded to the Firewall kernel, which will then create a template of the connection. The template will contain all the relevant information for the connection, such as source and destination IP addresses, destination port, NAT information, policy decision, etc. The template will be used by SecureXL to handle subsequent connections on the same service, without involving the Firewall kernel. This reduces the CPU load and increases the throughput.
There are three types of SecureXL templates: Accept, Drop, and NAT. Accept templates are used for connections that are allowed by the Firewall policy. Drop templates are used for connections that are blocked by the Firewall policy. NAT templates are used for connections that require NAT translation. Deny templates are not a valid type of SecureXL template.