A Lay Witness Differs from an Expert Witness in That

A lay witness differs from an expert witness in that:

A) An expert witness must qualify as an expert in order to testify whereas a lay person only needs to observe an event.
B) An expert witness provides testimony to explain things that the jury otherwise could not understand whereas a lay witness's testimony is limited to what he or she witnessed with one of his or her senses.
C) An expert witness's testimony is based on scientific, technical, or other specialized knowledge whereas a lay person's testimony is based on information obtained for one of his or her five senses.
D) All of the above are correct.