單項選擇題

An administrator needs to add the /usr/vac/bin directory to their PATH environment variable for the current session. 
Which of the following will accomplish this task()

A.path=$path:/usr/vac/bin; export path
B.path.=/usr/vac/bin; export $path
C.Modify the path environment variable in /etc/profile
D.Modify the path environment variable in /.profile

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