Which version of Windows 7 cannot be upgraded to a higher version of Windows 7?

You show or hide all comments by clicking the ________ button

Fill in the blank(s) with correct word

Fred's company wants to ensure the integrity of email messages sent via their central email servers. If the confidentiality of the messages is not critical, what solution should Fred suggest?

A. Digitally sign and encrypt all messages to ensure integrity. B. Digitally sign but don't encrypt all messages. C. Use TLS to protect messages, ensuring their integrity. D. Use a hashing algorithm to provide a hash in each message to prove that it hasn't changed.