Attorney Smithers Represented Computers, Inc

Attorney Smithers represented Computers, Inc.in its initial incorporation five years ago.Today, Ms.Perkins has asked him to represent her in a patent-infringement action against Computers, Inc.As a result of his former representation of Computers, Inc., Smithers is very knowledgeable about its
Products and their patents.May attorney Smithers represent Ms.Perkins in a patent infringement action against Computers, Inc.?

A) Yes, because Computers, Inc.is a former client
B) No, because it would constitute simultaneous representation
C) Yes, because it would not breach any ethical rules
D) No, because it would breach the conflict of interest rule