1. If a, b and c are unit vectors, then la bl2+ lb-cl2+lc-al2 does not exceed A) 4 B) 9 C) 8 D) 6 2. If vectors a 2i+k,b-1+j+k and c-4i-3j+7k. If dxb cx band d.a 0, then d will be A) 1+8j+2k B) 1-8j+2k C)-+81-k D)-1-8j+2k Here i, j, k are unit vectors in the x, y and z axis.