On a system with separate partitions for /, /usr, /var, /tmp, which filesystem[s] can safely be
mounted readonly?
A.
/var, /usr
B.
/var
C.
/usr, /, /tmp
D.
/usr
E.
/tmp
Explanation:
/tmp and /var both need to be written to. /usr is the most static of the directories (excluding
/usr/local)