Answer:
Four.
Step-by-step explanation:
A tetrameter, in poetry, is a line composed of four metrical feet (feet are the repeating rhythmic units that make up a line in a verse). Tetrameter is a word that comes from ancient Greek, where “tetra” means, literally, “four”, and “meter” means “measure”. Following the history of poetry, a tetrameter, depending on the rhythmic structure, can be subdivided in several categories.