To grant a user permission to run a specific expert mode command like tcpdump without providing full expert mode access, the command must first be made available in the Gaia CLISH shell. This is done using the add command feature. Then, Role-Based Administration (RBA) is used to create a custom role that includes only this newly defined command. Finally, a new user is created with a non-root UID (any UID other than 0) and assigned this restrictive role. This adheres to the principle of least privilege.

B. Assigning UID 0 grants superuser (root) privileges, which contradicts the requirement of limited access and is a significant security risk.

C. This option grants full expert-mode access and uses UID 0, both of which are explicitly against the stated requirements and security best practices.

D. This option incorrectly grants full expert-mode access to the role, which is what the administrator wants to avoid.

1. Check Point. (2023). R81.20 Gaia Administration Guide. Check Point Support Center. Chapter: "System Management", Section: "Role-Based Administration", Sub-section: "Adding an Expert Mode Command to a Role".

2. Check Point. (2023). R81.20 CLI Reference Guide. Check Point Support Center. Chapter: "User Management Commands", Section: "add command".