[单选]
EAP-FAST provides a secure tunnel during Phase One to protect the user’s authentication credentials.
Which of these entities initializes the secure tunnel？（）

A . generic token card
B . x.509 certificate
C . preshared key
D . Protected Access Credential

（）通常指没有保持职业上应有的职业谨慎。违约。普通过失。重大过失。欺诈。造林成活率目前实行单一银行制的国家有（）。英国。德国。法国。美国。空化思维贫乏常见于（）

EAP-FAST provides a secure tunnel during Phase One to protect the user’s authentication credentials.
Which of these entities initializes the secure tunnel？（）