Two vectors a and b are given. Determine the dot products a ⋅ b and a ⋅ a:
a = i, b = 18j

• A. a ⋅ b = 18, a ⋅ a = 1
• B. a ⋅ b = 0, a ⋅ a = 1
• C. a ⋅ b = -1, a ⋅ a = 0
• D. a ⋅ b = 1, a ⋅ a = 0