You administer Windows 8.1 Enterprise laptops. All of the computers are members of an Active Directory domain. When traveling, users access the corporate network by using a virtual private network (VPN).
You need to implement two-factor authentication. Which of the following should you use?
A. EAP-TLS
B. MS-CHAP v2
C. 802.1X
D. RADIUS
E. PPTP
F. L2TP/IPSEC
G. IPSEC/IKEv2
H. SSTP
