Jesse Owns a Computer on Which She Sends and Receives

Jesse owns a computer on which she sends and receives email.Abe monitors the emails sent and received by Jesse from her email account.Under which of the following circumstances would the ECPA consider Abe's actions as not violating the law?

A) if Abe and Jesse are colleagues in the same organization
B) if Abe was the employer of Jesse
C) if Abe stole Jesse's access codes to read her email
D) if Abe was investigating an illegal activity with an invalid warrant