单选题
An employee cannot access the company database. You check the connection variables: 
What is a valid explanation for why one of the users is unable to connect to the database?（）
发布日期：2021-01-28
Bob has max_user_connections set to zero, which blocks all his connections
Joe has exceeded the max_user_connections global limit
All users are blocked because max_user_connections is accumulated over the host account information
Kay is already connected elsewhere and attempting to log in again
Connect_timeout is too small to allow a connection to occur
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