At bookstore, a supply of solid colored T-shirts has just been received. The T-shirts come in the following colors: green, blue, white, yellow, and red. The manager decides to display one of each color T-shirts in a row on a shelf.

(a) In how many different ways can he display the five different color T-shirts on a shelf? (b) If he wants to place the blue T-shirts in the middle, in how many different ways can he arrange the T-shirts? (c) If he wants the white T-shirts to be the first T-shirts and the blue T-shirts to be the last T-shirts, in how many different ways can he arrange the T-shirts?