Let $f: \{1,2,3,4\} \to \{1,2,3,4\}$ and $g: \{1,2,3,4\} \to \{1,2,3,4\}$ be invertible functions such that $f \circ g = $ identity. Then (A) $f = g^{-1}$ (B) $g = f^{-1}$ (C) $f \circ g \neq g \circ f$ (D) $f \circ g = g \circ f$
Let $f: \{1,2,3,4\} \to \{1,2,3,4\}$ and $g: \{1,2,3,4\} \to \{1,2,3,4\}$ be invertible functions such that $f \circ g = $ identity. Then\\
(A) $f = g^{-1}$\\
(B) $g = f^{-1}$\\
(C) $f \circ g \neq g \circ f$\\
(D) $f \circ g = g \circ f$