Medium
$A$ set contains $11$ elements. The number of subsets of the set which contain at most $5$ elements is
- A${ }^{12}C_0 + { }^{12}C_2 + { }^{12}C_4$
- B${ }^{11}C_0 + { }^{11}C_1 + { }^{11}C_2 + { }^{11}C_3 + { }^{11}C_4 + { }^{11}C_5$
- C${ }^{11}C_0 + { }^{11}C_1 + { }^{11}C_2 + { }^{11}C_3 + { }^{11}C_4 + { }^{11}C_5$
- D${ }^{11}C_0 + { }^{11}C_1 + { }^{11}C_2 + { }^{11}C_3$
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