Find the slope of the line that goes through the given points. $(-4,-3)$ and $(-4,-5)$ Select the correct choice and, if necessary, fill in the answer box to complete your choice. A. The slope is (Simplify your answer.) B. The slope is undefined.

Step 1 ：Given the points \((-4,-3)\) and \((-4,-5)\), we can use the formula for finding the slope:

Step 2 ：\(slope = \frac{y2 - y1}{x2 - x1}\)

Step 3 ：Plug in the values: \(slope = \frac{-5 - (-3)}{-4 - (-4)}\)

Step 4 ：Since the denominator is 0, the slope is undefined.

Step 5 ：\(\boxed{\text{The slope is undefined}}\)