Correct Option is 4 : Amendment of the Constitution via article 368
Article 368 deals with the Powers of the Parliament to amend the Constitution and procedure thereof. It states Procedure through which Parliament can amend by way of addition, variation or repeal of any provision of the Constitution in accordance with the procedure established (Clause 1).

The National Defence Academy (NDA) is the Joint Services academy of the Indian Armed Forces, where cadets of the three services, the Army, the Navy and the Air Force train together located at Khadakwasla near Pune, Maharashtra. It is the first tri-service academy in the world.

In chemistry, the term transition metal has three possible meanings: The IUPAC definition defines a transition metal as "an element whose atom has a partially filled d sub-shell, or which can give rise to cations with an incomplete d sub-shell". Radium is not a transition metal. 

Amphibians are ectothermic, tetrapod vertebrates of the class Amphibia. Amphibians spend their lives in water and on land. There are more than 4,000 different kinds of amphibians. Members of this animal class are frogs, toads, salamanders, newts, and caecilians or blindworms.

Before interchange their position, Rahul and Ajay are 19th from top and 21st from bottom respectively, after interchange Ajay becomes 28th from bottom and at this place Ajay is 19th from top which means there are 18 boys ahead of Ajay and 27 boys beyond Ajay, therefore there are 46 boys in the row.

The Pattern is as follows:-
S+U+N=19+21+14=54+1=55
R+A+T=18+1+20=39+1=40
Similarly,
G+U+N=7+21+14=42+1=43

When you look at your image in a plane mirror, you see an upright image; it is located on the other side of the mirror (and thus is virtual); finally, it has the same dimensions (height, width) as you have.(the object).