In which sentence is the underlined phrase an adjective phrase?

The best examples of her artistry were featured in the gallery show.

She has been painting on cardboard for at least a decade.

The best examples of her artistry were featured in the gallery show.

She has been painting on cardboard for at least a decade.

The underlined phrase "of her artistry" is an adjective phrase in the sentence "The best examples of her artistry were featured in the gallery show."