Bob and Alice are using a unix file system as described in Section 2.5. The file system has two disks, mounted as /disk1 and /disk2. A system administrator creates a “home” directory containing symbolic links to the home directories of Bob and Alice via the commands:

Subsequently, Bob types the following to his shell:

and receives an error. Which of the following best explains the problem?

A. The unix file system forbids the use of “..” in a cd command when the current working directory contains a symbolic link.

B. Since Alice’s home directory now has two parents, the system complains that “..” is ambiguous in that directory.

C. In Alice’s home directory, “..” is a link to /disk1, while the directory “bob” is in /disk2.

D.  Symbolic links to directories on other disks are not supported in the unix file system; their call-by-name semantics allows their creation but causes an error when they are used.

mkdir /home In s/disk1/alice /home/alice Ins/disk2/bob /home/bob