You're given the output of an Is $-$ I of a file in Linux.

$1$ Is $-$ l books$\_$file.

$2$

$3$ dr$-$x$-$wxr$--1$ phelan cool$\_$group $0$ Aug $2011$:$10$ books$\_$file

Answer the following question: Who does the last trio of bits $(r--$ in the file permission and attributes refer to$?$

All other users

File owner

Regular file

Group file belongs to