1. Write a subroutine which accepts a number in ax register as parameter, and returns the count of 1's in its binary representation in dx register. For example number of 1 in 7's binary representation (0000 0111) are 3. And in 121 (0111 1010) are 5. 2. Call your subroutine by passing it last 4 digits of your roll number. Hint: to return from subroutine you can simply copy the number into dx register without saving and restoring it.