On a pay stub, what is the difference between "Net Pay" and YTD Net Pay"?

On a pay stub, what is the difference between “Net Pay” and YTD Net Pay"?

A. Net Pay is how much you’ve made in a year, YTD Net Pay is how much is withheld for taxes.
B. Net Pay is how much you’ve made during a pay period, YTD Net Pay is how much is withheld for taxes.
C. Net Pay is how much you’ve made during a pay period, YTD Net Pay is how you’ve made this year.
D. Net Pay is how much you’ve made minus taxes in one year, YTD Net Pay is how you’ve made in the last pay period.