What does the lock-symbol in the left column mean?

View the rule below .

What does the lock-symbol in the left column mean? (Choose the BEST answer.)
A . The current administrator has read-only permissions to Threat Prevention Policy.
B . Another user has locked the rule for editing.
C . Configuration lock is present. Click the lock symbol to gain read-write access.
D . The current administrator is logged in as read-only because someone else is editing the policy.

Answer: B

Explanation:

https://sc1.checkpoint.com/documents/R80/CP_R80_SecMGMT/html_frameset.htm?topic=documents/R80/CP_R80_SecMGMT/124265