John works as a Desktop Technician for NetPerfect Inc. The company has a Windows-based network. For the last few days, the network of the company has become prone to the Man-in-the- Middle attack…

John works as a Desktop Technician for NetPerfect Inc. The company has a Windows-based network. For the last few days, the network of the company has become prone to the Man-in-the- Middle attack. John wants to send a confidential MS-Word file to his Manager through e-mail attachment. He wants to ensure that no one is able to open and understand the file's message except the Manager. Which of the following should John use to accomplish the task? Each correct answer represents a part of the solution. Choose all that apply.