Identify the error in the following sentence and choose the option that corrects it: "If Ananya would have studied harder, she would have passed the exam."

1. If Ananya have studied harder, she would have passed the exam.
2. If Ananya studied harder, she would have passed the exam.
3. If Ananya had studied harder, she would have passed the exam.
4. If Ananya will study harder, she would have passed the exam.