Which of the following uses encryption to provide secure access to a remote computer over the Internet?

a. Virtual private network (VPN)
b. File transfer protocol (FTP)
c. Indexing
d. Data warehousing

a. Virtual private network (VPN)
Wary companies have begun to include special security requirements for mobile devices as part of their security policies. In some cases, users of laptops and mobile devices must use a virtual private network (a method employing encryption to provide secure access to a remote computer over the Internet) to gain access to their corporate network.