Let n be a natural number. Suppose we have an unlimited supply of Canadian nickels (5 cents), dimes (10 cents), quarters (25 cents), loonies (100 cents), and toonies (200 cents). How many ways can we make exact change for ncents using these coins?
a) n⋅(n+1)(n+2)(n+3)
b) (n+4)(n+3)(n+2)(n+1)
c) (n+5)(n+4)(n+3)(n+2)
d) (n+5)(n+4)(n+3)(n+2)(n+1)