Which of the following are the advantages of MOS devices over bipolar devices?
(1) Easy to fabricate
(2) Allows higher bit densities
(3) Cost effective
(4) Operational speed
(a) 1, 2, 3 and 4 (b) 1, 2 and 3 only
(c) 2, 3 and 4 only (d) 1, 3 and 4 only