Приведите дробь \(\dfrac{y}{y - a}\) к знаменателю \(a^2 - 2ay + y^2.\)

• \(\dfrac{y^2 +ay}{a^2 - 2ay + y^2}\)
• \(\dfrac{y^2 - ay}{a^2 - 2ay + y^2}\)
• \(\dfrac{ay - y^2}{a^2 - 2ay + y^2}\)
• \(\dfrac{ay}{a^2 - 2ay + y^2}\)