Let U = {0, 1, 2, 3, 4, 5, 6 $$\left| A ^ { \prime } \cup B ^ { \prime } \right|$$

Multiple Choice

Let U = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, r, s, t}
A = {0, 2, 4, 8, r, t}
B = {1, 3, 7, 8, 9, s, t}
Find the following:
- $$\left| A ^ { \prime } \cup B ^ { \prime } \right|$$

A) 11
B) 12
C) 10
D) 13
E) None of these