Booleans and testing

3a) Write method alternating that takes four booleans and that returns true iff the four values alternate true and false.

// returns true iff a,b,c,d alternate values

public boolean alternating(boolean a, boolean b,

boolean c, boolean d)

3b) Identify five useful test cases for a definition of alternating that can be used to investigate its correctness. For each case, give a reason why it is a useful test of the method.