Digital Options Can Be Used to Synthetically Create a Position

Digital options can be used to synthetically create a position in a zero coupon bond by

A) purchasing a cash-or-nothing digital put and selling an asset-or-nothing digital call
B) purchasing both a cash-or-nothing digital call and a cash-or-nothing digital put
C) purchasing both an asset-or-nothing digital call and an asset-or-nothing digital put
D) purchasing a cash-or-nothing digital call and selling a cash-or-nothing digital put
E) purchasing an asset-or-nothing digital call and selling an asset-or-nothing digital put