For the set $X = \{ 1,2,3,4 \}$, how many functions $f : X \rightarrow X$ satisfy the following condition? [3 points] $\square$ (1) 64 (2) 68 (3) 72 (4) 76 (5) 80
For the set $X = \{ 1,2,3,4 \}$, how many functions $f : X \rightarrow X$ satisfy the following condition? [3 points]\\
$\square$\\
(1) 64\\
(2) 68\\
(3) 72\\
(4) 76\\
(5) 80