Let U={1,2,…,10}U = \{1, 2, \dots, 10\}U={1,2,…,10}. If A={x∣x is prime}A = \{x \mid x \text{ is prime}\}A={x∣x is prime} and B={x∣x is even}B = \{x \mid x \text{ is even}\}B={x∣x is even}, what is (A∪B)c(A \cup B)^c(A∪B)c?
{1,9}\{1, 9\}{1,9}
{1,7,9}\{1, 7, 9\}{1,7,9}
{9}\{9\}{9}
{1,3,9}\{1, 3, 9\}{1,3,9}