$+------------------------------------------------------+$

$|$ File $||$ Group $|$ Mode Bits $|$

$+----------------------------------------------------+$

$|$ foo $|$ alice $|$ faculty$|$ rwxr$--$r$--|$

$|$ bar $|$ bob $|$ students$|$ rw$-$rw$-$r$--|$

$|$ baz $|$ charlie $|$ faculty$|$ rwxrwxrwx $|$

If Bob wants to read and write to the foo file, who can give him permissions?