Question: How many elements are in ( i . e . , what is the size of ) the following set: { { } } {

How many elements are in (i.e., what is the size of) the following set:
{
{
}
}
{{}}
(Select the one best answer)
Choice 1 of 4:zero
Choice 2 of 4:one
Choice 3 of 4:two
Choice 4 of 4:three

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