Write down all the subsets of the given set.{2, ?, 9, ?}
A. {2}, {?}, {9}, {?}, {2, ?}, {2, 9}, {2, ?}, {?, 9},
{?, ?}, {9, ?}, {2, ?, 9}, {2, ?, ?}, {2, 9, ?}, {?, 9, ?}, ?
B. {2}, {?}, {9}, {?}, {2, ?}, {2, 9}, {2, ?}, {?, 9},
{?, ?}, {9, ?}, {2, ?, ?}, {2, 9, ?}, {?, 9, ?},
{2, ?, 9, ?}, ?
C. {2}, {?}, {9}, {?}, {2, ?}, {2, 9}, {2, ?}, {?, 9},
{?, ?}, {9, ?}, {2, ?, 9}, {2, ?, ?}, {2, 9, ?}, {?, 9, ?},
{2, ?, 9, ?}, ?
D. {2}, {?}, {9}, {?}, {2, ?}, {2, 9}, {2, ?}, {?, 9},
{?, ?}, {9, ?}, {2, ?, 9}, {2, ?, ?}, {2, 9, ?}, {?, 9, ?},
{2, ?, 9, ?}
Answer: C
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