Which of the following are nitrogen-fixing plants?AlfalfaAmaranthChickpeaCloverPurslane (Kulfa)SpinachSelect the correct answer using the code given below:a. 1, 3 and 4 onlyb. 1, 3, 5 and 6 onlyc. 2, 4, 5 and 6 onlyd. 1, 2, 4, 5 and 6