Answer:
It is fraud-proof.
Explanation:
i just took the test (I do k12)
Assuming the italicized clause is <em>Since its establishment, </em>the correct answer here is elliptical clause.
Elliptical means that a word which would normally be part of a sentence is excluded, usually for stylistic reasons. Here, the verb is missing, which is why it is elliptical. The question is oddly formulated too - given that there is no verb here, it cannot be a clause, but rather a phrase, but since there is no such option here, then the correct answer is elliptical clause.
Answer:
The times gone past; the good old days. as taken from ask.com 's dictionary. perhaps also "for old time's sake" (for the sake of Auld Lang Syne)