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单项选择题In form-based authentication, what must be included in the HTML returned from the URL specified by the  element?()

A、 a base-64 encoded user name and password

B、 a form that POSTs to the j_security_check URL

C、 an applet that requests the user name and password from the user

D、 a hidden field that supplies the login-constraint used by the application

  • B
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