List the Elements of the Set $A \cup B \text {, }$

Multiple Choice

List the elements of the set.
-If A={47,48,49,52} and B={45,47,48,50} , list the elements of $A \cup B \text {, }$

A) $\varnothing$
B) {45,49,50,52}
C) {47,48}
D) {45,47,48,49,50,52}