The graph of the line y = 4 is a
Avertical line with a slope of zero.
Bhorizontal line with a slope of zero.
Cvertical line with an undefined slope.
Dhorizontal line with an undefined slope.
Avertical line with a slope of zero.
Bhorizontal line with a slope of zero.
Cvertical line with an undefined slope.
Dhorizontal line with an undefined slope.