A sequence can be generated by using an = 7a(n-1), where a₁ = 5 and n is a whole number greater than 1. What are the first four terms in the sequence? A. 5, 35, 245, 1715 B. 50, 20, 80, 320 C. 5, 30, 180, 1080 D. 5, 24, 125, 625​