Which of the following statements is/are correct about the Aadhaar Scheme ?

1.     Unique Identification numbers and Aadhaar cards are being given to all residents of India, including noncitizens.

2.     Aadhaar is a 12-digit unique number issued by UIDAI.

3.     UIDAI was established by a law passed by the Parliament.

4.     Aadhaar will be issued on a mandatory basis.

Select the correct answer using the code given below