Go through the data set given below and solve the questions based on it.
Following is the area diagram given for the sales value of ABC Limited for the four quarters of the year 2007. ABC Limited has its operations in three zones—North, West and East. Below given data set represents the stacked contribution of these three zones in every quarter of the year 2007.
If we rank the contribution of zones in each of the quarters, then how many zones will have the same rank across all the quarters?