A $13-$month$-$old says "wawa," meaning "I want some water." When water is poured into his cup, he says "wawa," meaning "This is water." After drinking a sip, he hands his cup toward his dad and says "wawa," meaning $"$Do you want my water?" In each communication, "wawa" is an example of:

a synonym.

motherese.

holophrasic speech.

receptive language.