Which of the following functions are onto functions?

f:Z$->(0,1,2,3,4),$ where f$($x$)=1\%5$

f:ZZ$,$ where f$($z$)=2+3$

f:ZZ$,$ where f$($x$)=$x$+2$ using computational integer division.

f:Z$->$ N$.$ where f$($x$)=$ x$^2$

f:Z$->\{0,1,2,3\},$ where f$($z$)=\%3$

f:ZZ$,$ where f$($x$)=-1729$

f: ZZ$,$ where f$($x$)=$ x x $2$

ent

A

f: ZR$,$ where f$($x$)=$ x