find the value of

Correct option is A

Given: 

$$y+\frac{1}{y}=4 \\ \text{ Value of }\ \ \ y^2+\frac{1}{y^2}$$ 

Formula Used: ​

​$$\left(y+ \frac{1}{y} \right)^2 = y^2 + \left(\frac{1}{y} \right)^2 + 2$$   

Solution:​