Final answer:
The initial step in a security context when dealing with a caller is to ask for verification of their identity to ensure they are authorized to receive any sensitive information.
Step-by-step explanation:
In a security context, the initial step to take when dealing with a caller is c) Ask the Caller for verification of their identity. This is a critical measure for verifying the legitimacy of the person on the other end of the line and ensuring that sensitive information is not disclosed to unauthorized individuals. One should never ignore the call or hang up immediately, as it might be a legitimate contact; however, it is equally important not to share personal information without confirming the caller's identity first. Protocols such as asking for a name, company, and purpose of the call, as well as contacting the company directly via a trusted number, are key verification steps.