Read and choose the correct indefinite article according to the number and gender of the noun that follows.

tú tienes directora inteligente, bonita y alta.

una
un
unos
unas

In Spanish grammar the article is a word that clearly indicates the gender and the number of the noun. Its function is to modify the noun it introduces.

In the specific case of the Indefinite Articles, we have:

Singular Masculine: un/uno

Singular Femenine: una

Plural Masculine: unos

Plural Femenine: unas

Now, in this sentence the word (noun) directora is Singular Femenine, therefore the correct indefinite article is una, and the complete sentence is:

You have an intelligent, beautiful and tall director.