Read the poem below and answer the question.

the eagle

he clasps the crag with crooked hands;
close to the sun in lonely lands,
ringed with the azure world, he stands.

the wrinkled sea beneath him crawls;
he watches from his mountain walls,
and like a thunderbolt he falls.

each line includes four metrical feet, creating what kind of meter?
trimeter
tetrameter
pentameter
hexameter