Does anyone know how to find the unit vector of: v: < -6, -8> ?

it's either,
a.) < 3/5, 4/5 >
b. < -3/5, -4/5 >
c.) < 4/5, 3/5 >
d.) < -4/5, -3/5 >
.

The table below represents the displacement of a fish from its reef as a function of time: time (hours) x displacement from reef (feet) y 0 4 1 64 2 124 3 184 4 244 part a: what is the y-intercept of the function, and what does this tell you about the fish? (4 points) part b: calculate the average rate of change of the function represented by the table between x = 1 to x = 3 hours, and tell what the average rate represents. (4 points) part c: what would be the domain of the function if the fish continued to swim at this rate until it traveled 724 feet from the reef? (2 points)