Which Control Panel application should you use?

Note: This question is part of a series of questions that use the same or similar answer choices. An answer
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You need to change the password used for an L2TP VPN connection.
Which Control Panel application should you use?

A.
Work Folders

B.
Phone and Modem

C.
Credential Manager

D.
Sync Center

E.
System

F.
Network and Sharing Center

G.
RemoteApp and Desktop Connections

H.
Power Options

Explanation:
https://www.watchguard.com/help/docs/wsm/xtm_11/en-us/content/en-us/mvpn/l2tp/
l2tp_vpn_client_win7_c.html