Which of the following functions is a one$-$to$-$one correspondence?

Question $3$ options:

f: $->,$ where f$($n$)=$n$/2+2$

f: $->,$ where f$($x$)=$ x$^3+1$

f: $->,$ where f$($n$)=|$n $-3|$

f: $->,$ where f$($x$)=2$x$^2+1$