The value of $'c'$ for which the set, $\{(x, y) | x^2 + y^2 + 2x \le 1 \} \cap \{(x, y) | x - y + c \ge 0\}$ contains only one point in common is :
The value of $'c'$ for which the set, $\{(x, y) | x^2 + y^2 + 2x \le 1 \} \cap \{(x, y) | x - y + c \ge 0\}$ contains only one point in common is :
- A
$(-\infty , -1] \cup [3, \infty )$
- B
$\{-1, 3\}$
- C
$\{-3\}$
- D
$\{- 1 \}$
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- [IIT 1988]
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