Let $A=\{4,6,8,10,12\}$. Insert $\subseteq$ or $\nsubseteq$ to make the given statement true. $\varnothing$ A Choose the correct answer below that makes a true statement. \[ \varnothing \square\{4,6,8,10,12\} \]

Step 1 ：Let $A=\{4,6,8,10,12\}$.

Step 2 ：Insert $\subseteq$ or $\nsubseteq$ to make the given statement true.

Step 3 ：$\varnothing$ A

Step 4 ：The question is asking whether the empty set is a subset of the set A.

Step 5 ：By definition, the empty set is a subset of every set.

Step 6 ：Therefore, the correct symbol to insert is $\subseteq$.

Step 7 ：Final Answer: $\boxed{\varnothing \subseteq \{4,6,8,10,12\}}$