Bob and Joe Both Have Administrator Roles on Their Gaia

Bob and Joe both have Administrator Roles on their Gaia Platform. Bob logs in on the WebUI and then Joe logs in through CLI. Choose what BEST describes the following scenario, where Bob and Joe are both logged in:

A) When Joe logs in, Bob will be log out automatically.
B) Since they both are log in on different interfaces, they both will be able to make changes.
C) If Joe tries to make changes, he won't, database will be locked.
D) Bob will be prompt that Joe logged in.