Which of the following statements about how infants perceive the structure of speech is true?
◦ Rules that infants extract from the speech stream do not generalize to nonspeech sounds.
◦ Parents must directly teach word-order rules for infants to understand the basic grammar of their language.
◦ Infants locate words by discriminating syllables that often occur together from syllables that seldom occur together.
◦ Infants do not become sensitive to the speech structure of individual words until after their first birthday.