The interquartile range (IQR) is defined as the difference between the first and third quartiles (Q3 − Q1). What feature of the box-and-whisker plot does the IQR describe?

Athe median of the data set

Bthe full length of the box-and-whisker plot

Cthe length of the box of the box-and-whisker plot

Dthe average length of the two whiskers of the box-and-whisker plot