Let $$\begin{array} { l } U = \{ 1,2,3,4,5,6,7,8,9,10 \} \\A = \{ 3,5,7 \} \\B = \{ 5,8,9 \}\end{array}$$

Multiple Choice

Let $$\begin{array} { l } U = \{ 1,2,3,4,5,6,7,8,9,10 \} \\A = \{ 3,5,7 \} \\B = \{ 5,8,9 \}\end{array}$$ List all the members of the set. $A \cup B$

A) $\{ 3,5,7,8,9 \}$
B) $\{ 5,8,9 \}$
C) $\{ 3,5,7 \}$
D) $\{ 5 \}$
E) $\varnothing$