Wolodko Engineering Inc Sued Dhaliwal Ltd for the Tort of Negligence.At

Wolodko Engineering Inc sued Dhaliwal Ltd for the tort of negligence.At one point during the litigation process,an examination-in-chief occurred.This means that

A) one of the parties asked the other party's witness a question during an examination for discovery.
B) the other side asked the opponent's witness questions under oath.
C) one of the parties hired an expert witness to conduct a scientific investigation on a piece of physical evidence.
D) the examination in chief occurred while the case was on Appeal.
E) questions were answered under oath at a trial by one party of its own witnesses.