If $A = \{x, y\}$ then the power set of $A$ is
- A$\{ \{x\}, \{y\} \}$
- B$\{ \phi, x, y \}$
- C$\{ \phi, \{x\}, \{y\} \}$
- D$\{ \phi, \{x\}, \{y\}, \{x, y\} \}$
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