单选题The man page for command shows the following syntax: The man page for command shows the following syntax: command [ -a | -b ] Which of the following statements is true regarding this entry?（）AEither the -a or flag -b may be used, but not both.BIf the flag -a is used then the flag -b also must be used.COne of the -a or -b flags must be used, but not both at the same time.DBoth the flags may be used together, but neither are mandatory.
单选题
The man page for command shows the following syntax: The man page for command shows the following syntax: command [ -a | -b ] Which of the following statements is true regarding this entry?（）
A
Either the -a or flag -b may be used, but not both.
B
If the flag -a is used then the flag -b also must be used.
C
One of the -a or -b flags must be used, but not both at the same time.
D
Both the flags may be used together, but neither are mandatory.
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