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單項(xiàng)選擇題

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

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