In Cooper Tire & Rubber V

In Cooper Tire & Rubber v.Mendez,involving a tire blowout that resulted in deaths in an accident,the Texas high court held that:

A) the head of a corporation is never required to testify in a deposition
B) the head of a corporation is only required to answer written interrogatories,not appear for a deposition
C) the head of a corporation may send a qualified corporate officer to testify in his place
D) the expert witness for Cooper could not be a company employee
E) none of the other choices are correct