Relation 3 \[ \{(c, t),(f, n),(f, c),(c, f)\} \] Function Not a function

Step 1 ：Check if each input is associated with exactly one output

Step 2 ：Given relation: \(\{(c, t),(f, n),(f, c),(c, f)\}\)

Step 3 ：Input 'c' is associated with both 't' and 'f'

Step 4 ：Input 'f' is associated with both 'n' and 'c'

Step 5 ：The given relation is not a function