Which description compares the domains of Function A and Function B correctly?

Function A: f(x)=−3x+2

Function B:

Half of a parabola graphed on a grid in Quadrant One with the x and y axis beginning at negative ten and increasing in increments of two until reaching ten. The parabola, labeled g of x, contains a filled in point at begin ordered pair zero comma zero end ordered pair, passes through begin ordered pair two comma two end ordered pair and begin ordered pair four comma eight end ordered pair, and as a smooth curve while extending to infinity.

The domain of both functions is the set of real numbers greater than or equal to 0.

The domain of both functions is the set of real numbers.

The domain of Function A is the set of real numbers.
The domain of Function B is the set of real numbers greater than 0.

The domain of Function A is the set of real numbers.
The domain of Function B is the set of real numbers greater than or equal to 0.