Set X consists of the integers from 1 to 12, inclusive, while set Y consists of the integers from 0 to 20, inclusive. How many distinct integers do belong to the both sets at the same time?
Choose the correct choice from the following choices:  A) 12  B) 15  C) 10  D) 20  E) 8
X= {1,2,3,4, 5,6, 7, 8, 9, 10, 11, 12}   Y = {0,1,2,3,4,5,6, 7, 8, 9, 10,11,12,13,14,15,16,17,18,19,20}   Common elements = {1,2,3,4,5,6,7,8,9,10,11,12} = 12 elements   12nswer: Option 12.
<result>A</result>
Set X consists of the integers from 1 to 12, inclusive, while set Y consists of the integers from 0 to 20, inclusive. How many distinct integers do belong to the both sets at the same time?