Consider the code contains following variables. var1 DWORD 10h var2 DWORD 20h var3 DWORD 30h var4 DWORD 40h Write code to exchange the values among the variables above. You can ONLY move (MOV) or exchange (XCHG) values from variable to another. No other instructions are allowed. You can only use one temporary storage variable or register. After executing your code, var1 contains 30h, var2 contains 10h, var3 contains 40h, and var4 contains 20h.