Which of the following statements is correct?
a. A virtual private network (VPN) is a private network within a public network.
b. Cloud computing allows client firms to acquire IT resources from vendors in strict accordance with long-term contracts that stipulate services.
c. A packet combines the messages of multiple users into a unit for transmission. At the receiving end, the packet is disassembled into individual messages and distributed to the users.
d. An advantage of cloud computing over traditional outsourcing is that internal control and security issues are not concerns for the client firm, but are the responsibility of the cloud service provider.
e. None of the above is correct.