(A) $fof=\left\{\begin {array}{c,c,c} 2-|x| & if\:x<-1\\ |x| &\:\:if\:\:-1\leq x\leq 1\\|2-x| & if\:x>1\end {array}\right.$
(B) $fof=\left\{\begin {array}{c,c,c} |x| & if\:x<-2\\2- |x| &\:\:if\:\:-2\leq x\leq 2\\|2-x| & if\:x>1\end {array}\right.$
(C) $fof=\left\{\begin {array}{c,c,c} |2-x| & if\:x<-3\\ |x| &\:\:if\:\:-1\leq x\leq 1\\2-|x| & if\:x>1\end {array}\right.$
(D) $fof=\left\{\begin {array}{c,c,c} |x| & if\:x<-1\\2- |x| &\:\:if\:\:-3\leq x\leq 3\\|2-x| & if\:x>3\end {array}\right.$
