Which description defines a rhyme scheme?

the elements that emphasize sounds of words
the elements that emphasize sounds of words

a pattern based on the last sound of each line
a pattern based on the last sound of each line

the pattern of repetition of a letter sound
the pattern of repetition of a letter sound

the order of stressed and unstressed syllables
the order of stressed and unstressed syllables

a pattern based on the last sound of each line