Which statement is true?
A – All vertical lines have a slope of zero.
B – All vertical lines have a positive slope
C – All vertical lines have a negative slope.
D – All vertical lines have an undefined slope.

Which statement is true? A – All vertical lines have a slope of zero.
B – All vertical lines have a positive slope
C – All vertical lines have a negative slope.
D – All vertical lines have an undefined slope.

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