You want to implement an 8:1 MUX but you only have 2:1 and 4:1 MUXes to choose from. Which of the following options allow you to implement 8:1 MUX operation?
a) One 2:1 MUX, two 4:1 MUX
b) Two 2:1 MUX
c) One 4:1 MUX, two 2:1 MUX
d) Three 2:1 MUX