单项选择题

Which of the following commands makes /bin/foo executable by everyone but writable only by its owner？（）

A. chmod 557 /bin/foo
B. chmod o+rwx.a+rx/bin/foo
C. chown 557 /bin/foo
D. chmod 755/bin/foo

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LX0-101

Which of the following commands makes /bin/foo executable by everyone but writable only by its owner？（）