Option A is the most advisable answer because CHFI v11 explicitly includes “Investigating Brute Force Attack and Cookie Poisoning Attack” and also covers tools to examine the cache, cookie, and history recorded in web browsers and private browsing and browser artifact recovery . These objectives reflect the forensic importance of cookies and the risks associated with manipulated or abused session data.

If Alice is concerned that stored session cookies may be unsafe or tampered with, the safest immediate user action is to clear the cookies, log out, and re-authenticate carefully . That reduces the risk of relying on an existing persistent session that may have been compromised or altered. It is a direct action tied to the actual risk described.

MFA is a good security practice overall, but it is not the most immediate next step once the concern is already about an active remembered session. Creating a new account does not address the underlying issue. Using a VPN or privacy extension does not neutralize a potentially unsafe session cookie. Therefore, the most sensible action is to clear cookies and log out before proceeding .