Read the following lines from the poem "Curiosity."

They stared transfixed for hours, not realizing time was slipping by.
Then, the goddesses stopped singing, and they all said goodbye.
Astra and Nova returned home before long,
With the memory of the goddess' enchanting song.

What is the rhyme scheme of these four lines?
Question 2 options:

ABBA

ABAB

AAAB

AABB