单项选择题

A Denial of Service (DoS) attack is:（）

A. an attempt to bring down a website or other online service.
B. a prank where someone sends an unauthorized e-mail attempting to close a user’s e-mail account.
C. stealing a user’s identity and making changes to their accounts.
D. an attempt to change a user’s password to prevent access to a service by repeatedly guessing the user’s information.

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