单项选择题
Given an HttpServletRequest request and HttpServletResponse response，which sets a cookie "username"with the value "joe" in a servlet？（）
A.request.addCookie（"username"， "joe"）
B.request.setCookie（"username"， "joe"）
C.response.addCookie（"username"， "joe"）
D.request.addHeader（new Cookie（"username"， "joe"））
E.request.addCookie（new Cookie（"username"， "joe"））
F.response.addCookie（new Cookie（"username"， "joe"））
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