Can You Find the Sum of the Infinite Geometric Series $4+12+36+\cdots$

Multiple Choice

Can you find the sum of the infinite geometric series $4+12+36+\cdots$ ? Why or Why not?

A) No. This is not a geometric series.
B) No. The common ratio, $r$ , is greater than 1 .
C) Yes. This is a geometric series.
D) Yes. The common ratio, $r$ , is less than 1 .