`if A={(x,y):x^(2)+y^(2)le1,x,yinR]`and
`B={(x,y):x^(2)+y^(2)le x^(2)+y^(2)le 4, x,yin R]`then

Options

A. `A-B=A`
B. `B-A=B`
C. `A-B=phi`
D. `B-A=phi`

Explanation

To solve the problem, we need to analyze the sets A and B defined by the conditions given in the question.

### Step 1: Define the Sets
Set A is defined as:
\[ A = \{(x, y) : x^2 + y^2 \leq 1, \, x, y \in \mathbb{R}\} \]
This represents all the points (x, y) that lie inside or on the boundary of a circle with radius 1 centered at the origin (0, 0).

Set B is defined as:
...