What is the rhyme scheme of the following poem?

He sat upon his brand new bike
Waiting for his best friend Mike.
He couldn’t wait to ride to school.
Others would say his bike is cool.
(1 point)
Responses

a a b b
a a b b

a b a b
a b a b

a b c d
a b c d

a a b a

a a b b

The rhyme scheme of the following poem is:

a a b b