In concurrency control, what is the primary difference between a "shared lock" and an "exclusive lock"?单项选择题

A

A shared lock requires a fat client, while an exclusive lock works with thin clients.

B

A shared lock allows others to read data, while an exclusive lock prevents all access.

C

A shared lock is used for vertical partitioning, while an exclusive lock is for horizontal.

D

A shared lock is permanent, while an exclusive lock expires after 60 seconds.

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