Which command is used to make all files and sub-directories in the directory (progs) executable by all users?

Which command is used to make all files and sub-directories in the dir

1.	Which command is used to make all files and sub-directories in the directory (progs) executable by all users?
A.	chmod -R a+x progs
B.	chmod -R 222 progs
C.	chmod -1 a+x progs
D.	chmod -x a+x progs
Answer» B. chmod -R 222 progs