Why is it important that analysts identify outliers in a dataset?

$($a$)$

To identify if a value was entered into the wrong dataset by an analyst

$($b$)$

To identify a valid, but rare observation within the dataset

$($c$)$

To identify if a value was transposed in the dataset by an analyst

$($d$)$

All of the Above

$($e$)$

None of the Above