Which option describes a complex sentence?

Question

A sentence that contains one independent clause and at least 1 dependent clause.
A sentence that contains 2 or more independent clauses joined with a comma and a conjunction.
A sentence that contains a subject and a verb and expresses a complete thought.
A sentence that contains at least 2 independent clauses and at least 1 dependent clause

Answer 1

The option that describes a complex sentence is:

A sentence that contains one independent clause and at least 1 dependent clause.