Hindi · Sentence Structure

Consider the following statements regarding sentence classification in Hindi grammar: I. A sentence containing one subject and one predicate is called a compound sentence (Sanyukt Vakya). II. A sentence with one principal clause and one or more dependent clauses is called a complex sentence (Mishr Vakya). III. A sentence in which two or more simple sentences or principal clauses are joined by a coordinating conjunction is called a compound sentence (Sanyukt Vakya). IV. Clauses that hold equal status to the principal clause are called coordinate clauses (Samananadhikaran Upavakya). Which of the above statements are correct?