Two of the Windows 2000 Professional workstations and one of the Windows 98 machines are used remotely via dial-up connections. You have recently had a number of outside attempts to gain access via the dial-up modems. Which of the following dial-up authentication methods could you use to provide the most improvement in security?

a. PAP

b. CHAP

c. MS-CHAP

d. MS-CHAP v2