What is the difference between the words “Cuántos” and “Cuántas”?

What is the difference between the words “Cuántos” and “Cuántas”?

One is used to describe quantities of singular items and the other is used to describe quantities of plural items.

One is for “I’ and the other is for “we”.

There is no difference and they can be used interchangeably.

One is used to describe quantities of masculine items and the other is used to describe quantities of feminine items.

The correct answer is: One is used to describe quantities of masculine items and the other is used to describe quantities of feminine items. "Cuántos" is used for masculine nouns and "Cuántas" is used for feminine nouns.