Grade 12 calculus. Dot and product. Please answer ASAP

Question 5 (1 point) Under which condition is x y = 0? a) T and y are in the same direction. O b) T' and y are perpendicular. O c) 7' and y are in opposite directions. Od) None of these conditions force * .> to be zero. Question 6 (1 point) Suppose * y = 2, x = 2 and > = 2. What is the angle between the vectors x and ) ? O a) 30 ( b) 60 O c) 450 O d) More information is required