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[" 28.If "vec u=vec a-vec b,vec v=vec a+vec b" and "|vec a|=|vec b|=2" ,then "|vec u timesvec v|" is "],[" equal to "],[[" (A) "sqrt(2(16-(vec a*vec b)^(2)))," (B) "2sqrt((16-(vec a*vec b)^(2)))],[" (C) "2sqrt((4-(bar(a)*vec b)^(2)))," (D) "sqrt(2(4-(vec a*vec b)^(2)))]]

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