Find the sum and the product of each of these pairs of numbers. Express your answers as a binary expansion?
a) (100 0111)2, (111 0111)2
b) (1110 1111)2, (1011 1101)2
c) (10 1010 1010)2, (1 1111 0000)2
d) (10 0000 0001)2, (11 1111 1111)2