Which of the following statements is true?

The highest and lowest costs are always used to analyze a mixed cost under the high$-$low method.

The high and low points used in the high$-$low method tend to be unusual and therefore the cost formula for the mixed cost may not accurately represent all of the data.

Multiple Choice

Only statement $1$ is true.

Only statement $2$ is true.

Both statements are true.

Neither statement is true.