For the given vectors a and b, compute the scalar product followed by determining the angle between the two vectors. Round the angle to the nearest tenth of a degree. 
a = 3i +17j, b = 21i -2j

• A. a⋅b = 97, θ = 84.5°
• B. a⋅b = 97, θ = 85.4°
• C. a⋅b = 29, θ = 84.5°
• D. a⋅b = 29, θ = 85.4°

Answer: (D)