Identify the rule (or formula) that generates the nth term of a Geometric Sequence from the choices below. A(n) is the nth term of the Geometric Sequence, a represents the first term, r is the common ratio, and n is the term number.
a) A(n)=a⋅r(n−1)
b) A(n)=a−r(n−1)
c) A(n)=a+r(n−1)
d) A(n)=a⋅r(a−1)