Question: What does it mean for set a to be a subset of set b ? a . All elements of set b exist in set

What does it mean for set a to be a subset of set b?
a. All elements of set b exist in set a.
b. The elements of set a are all less than the elements of set b.
c. Set a is a small part of or is equal to set b.
d. The length of set a is less than the length of set b.

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