What is the unit digit in 4^100?  Select:	A) 0	B) 1	C) 6	D) 3	E) 5

Rationale: unit digit in 4 ^ 100 = unit digit in [ ( 4 ^ 4 ) ^ 25 ] but unit digit in 4 ^ 4 = 6 unit digit 4 ^ 100 = 6 answer is c
Answer: C