3. The following statement creates a row entry in an Oracle spatial table named ourworld. INSERT INTO ourworld VALUES ( I 1,'shape_a',MDSYS.SDO_GEOMETRY(2002, null,null, MDSYS.SDO_ELEM_INFO_ARRAY(1,2,1), MDSYS.SDO_ORDINATE_ARRAY(4,14,8,14)) ); (a) Briefly describe the type of entry and sketch it, assuming local coordinates of a 20 by 20 rectangle with (0,0) the bottom left corner. (b) Give code for adding a circle under the given shape, of diameter 4