Question

how is a poems rhyme scheme marked and identified?
upper or lowercase letters, such as \abab\
roman numerals, such as \i, ii, i, ii\
arabic numerals, such as \1212\
punctuation symbols, such as \!?!?\

Explanation:

In poetry, the rhyme scheme is typically marked using letters (either uppercase or lowercase). Each new rhyme sound is assigned a new letter. For example, if the first and third lines rhyme, and the second and fourth lines rhyme, the rhyme scheme is marked as "ABAB". Roman numerals, Arabic numerals, and punctuation symbols are not standard ways to mark rhyme schemes.

Answer:

upper or lowercase letters, such as "ABAB"