The domain of definition of the function $f(x)$ given by the equation $2^x + 2^y = 2$ is
- A$0 < x \leqslant 1$
- B$0 \leqslant x \leqslant 1$
- C$-\infty < x \leqslant 0$
- D$-\infty < x < 1$
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