Subordinating conjunction is one that links the dependent clauses together.
The fourth option is correct.
What is conjunction?
Conjunction is one of the part of grammar which makes a connection in the clauses or sentences.
When the conjunction is used to combine the dependent clause with the independent clause in a particular sentence, then it is regarded as a subordinating conjunction. It can be a single word or a phrase.
Therefore, the dependent clauses are made by subordinating conjunction.
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