单选题A Denial of Service (DoS) attack is:（）Aan attempt to bring down a website or other online service.Ba prank where someone sends an unauthorized e-mail attempting to close a user’s e-mail account.Cstealing a user’s identity and making changes to their accounts.Dan attempt to change a user’s password to prevent access to a service by repeatedly guessing the user’s information.
单选题
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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