What is a valid explanation for why one of the users is unable to connect to the database?

An employee cannot access the company database. You check the connection variables:
Mysql> SHOW GLOBAL VARIABLES LIKE ‘%connect%’; 8 rows in set (0.00 sec) A look at
the user privileges shows: GRANT… TO ‘bob’@’%, example.com’ WITH
MAX_USER_CONNECTIONS 0; GRANT… TO ‘key’@’%, example.com’ WITH
MAX_USER_CONNECTIONS 1; GRANT… TO ‘joe’@’%, example.com’ WITH
MAX_USER_CONNECTIONS 50; What is a valid explanation for why one of the users is
unable to connect to the database?

A.
Bob has max_user_connections set to zero, which blocks all his connections

B.
Joe has exceeded the max_user_connections global limit.

C.
All users are blocked because max_user_connections is accumulated over the host
account information.

D.
Kay is already connected elsewhere and attempting to log in again.

E.
Connect_timeout is too small to allow a connection to occur.