Find the magnitude of vector v that has an initial point of (1,3) and a terminal point of (7,1) . (1 point) Responses Image with alt text: double vertical line bold v double vertical line equals 2 start root 10 end root Image with alt text: double vertical line bold v double vertical line equals 2 start root 14 end root Image with alt text: double vertical line bold v double vertical line equals 4 start root 2 end root