The Excel workbook REGIONS.XLS contains the following four worksheets:

     EAST

     WEST

     NORTH

     SOUTH

The following program is submitted:

  libname MYXLS 'regions.xls';

Which PROC PRINT step correctly displays the NORTH worksheet?

     A. proc print data=MYXLS.NORTH;run;

     B. proc print data=MYXLS.NORTH$;run;

     C. proc print data=MYXLS.'NORTH'e;run;

     D. proc print data=MYXLS.'NORTH$'n;run;

Answer: D

请帮忙解释一下这段程序，谢谢。