Which two signs and two numbers (NOT digits) need to be interchanged to make the given equation correct?

$$16 + 15 - 25 \times 4 \div 5 = 20$$

$$611\ \frac{\ 5}{ }=20$$$$16\ +\ 15\ -\ 25\times\ 4\ \frac{\ 5}{ }=20$$
* and / 16 and 25

$$25\ +\ 15\ -\ 16\ \frac{\ 4}{ }\times\ 5=20$$

$$40\ -\ 16\ \frac{\ 4}{ }\times\ 5=20$$

$$40\ -\ 4\times\ 5=20$$

$$40\ -20=20$$

$$20=20$$

+ and - 4 and 25

$$16\ -\ 15\ +\ 4\times\ 25\ \frac{\ 5}{ }=20$$

$$1\ +\ 4\times\ 25\ \frac{\ 5}{ }=20$$

$$5\times\ 5=20$$

$$25=20$$

* and / 16 and 4

$$4\ +\ 15\ -\ 25\ \frac{\ 16}{ }\times\ 5=20$$

$$19\ -\ 25\ \frac{\ 16}{ }\times\ 5=20$$

$$19\ -\ 25\ \ \frac{\ 80}{ }=20$$

$$19\ -\ 3.2=20$$

$$15.8=20$$

- and * 15 and 25

$$16\ +\ 25\times\ 15\ -\ 4\ \frac{\ 5}{ }=20$$

$$41\times\ 15\ -\ 4\ \frac{\ 5}{ }=20$$

$$615\ -\ 4\ \frac{\ 5}{ }=20$$

$$611\ \frac{\ 5}{ }=20$$

$$122.2=20$$

Hence option A is a correct answer i.e L.H.S=R.H.S