Two vectors have magnitudes 3 units and 4 units respectively. What should be the angle between them if the magnitude of the resultant is -
(i) 1 unit (ii) 5 unit (iii) 7 unit

Options

A. `180^@, 90^@, 0^@`
B. `80^@, 70^@, 0^@`
C. `90^@, 170^@, 50^@`
D. None of these