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Inform-basedauthentication,whatmustbeincludedintheHTMLreturnedfromtheURLspecifiedbytheelement?()

A.abase-64encodedusernameandpassword
B.aformthatPOSTstothej_security_checkURL
C.anappletthatrequeststheusernameandpasswordfromtheuser
D.ahiddenfieldthatsuppliesthelogin-constraintusedbytheapplication
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