A firm would consider establishing a virtual private network if it wanted to

A firm would consider establishing a virtual private network if it wanted to:

a.  prevent people who are not employees from being able to access its network.
b.  Set up a secure network connection with another firm for a short period of time.
c.  Obtain a broadband connection to the Internet
d.  Simulate a network before it became operational in order to identify any security leaks