Two Asset Cash Or Nothing Option
Two asset cash-or-nothing options have four types:
[1] Cash-or-nothing call
Pays out cash K if S1 > X1 and S2 > X2 at expiry.
[2] Cash-or-nothing put
Pays out cash K if S1 < X1 and S2 < X2 at expiry.
[3] Cash-or-nothing up-down
Pays out cash K if S1 > X1 and S2 < X2 at expiry.
[4] Cash-or-nothing down-up
Pays out cash K if S1 < X1 and S2 > X2 at expiry.