If the data sets described below were plotted on dot plots, which pair of data sets would show the most visual over lap?

Data set 1: mean=50; MAD =3/ Data set 2: mean = 50; MAD =7
Data set 1: mean =30; MAD=5/ Data set 2: mean = 30; MAD =6
Data set 1: mean = 45; MAD =4/ Data set 2: mean = 45; MAD = 2
Data set 1: mean = 15; MAD =1/ Data set 2: mean = 15; MAD =4