Final answer:
Enabling cookie storage for all websites is not a security best practice. It is important to use a secure and encrypted connection, regularly clear stored cookies, and review and adjust cookie settings.
Step-by-step explanation:
The answer is a) Enable cookie storage for all websites. Enabling cookie storage for all websites is not a security best practice because it increases the risk of unauthorized access to sensitive information. It is recommended to only allow cookies for trusted websites.
Using a secure and encrypted connection (https), regularly clearing stored cookies, and reviewing and adjusting cookie settings are all important security best practices to protect user privacy and prevent unauthorized access.