QUESTION $5$

Let $f$ be the function from $\{1,2,3,4,5\}$ to $\{1,2,3,4\}$ such that $f(1)=3,f(2)=2,f(3)=4,f(4)=1,$ and $f(5)=2.$ Which of the following

statements is true about $f?$

$f$ is onto and one$-$to$-$one

$f$ is not onto and not one$-$to$-$one

$f$ is one$-$to$-$one but not onto

$f$ is onto but not one$-$to$-$one

All functions are not onto