Read the excerpt from "The Pobble Who Has No Toes" by Edward Lear. What is the rhyme scheme?

The Pobble who has no toes

Swam across the Bristol Channel;

But before he set out he wrapped his nose

In a piece of scarlet flannel.

For his Aunt Jobiska said "No harm

Can come to his toes if his nose is warm;

And it's perfectly known that a Pobble's toes

Are safe,-provided he minds his nose!"

abcb efgf

abbc dede

abab ccdd

abbc deed