tion 2 vet vered ked out of og estion The function f(x, y, z) = cos√x² + 3y² + 2z² is continuous on A) R B) x ≥0, y ≥ 0, z≥0 C)x+√√3y+√2z ≥ 0 D) x²+3y²+2z² > 0 E) R³ (3-space)