It is important for system administrators to properly interpret permissions strings to correctly manage permissions. For example, which of these permissions strings is correct for a file named projectA with the user having read, write, and execute, the group having read and write, and others having read$-$only permissions granted?

A$.-$rw$-$rw$-$r$--$ projectA

B$.$drwxr$-$xr$-$x projectA

C$.-$rwxrw$-$r$--$ projectA

D$.-$rwxrw$----$ projectA