USING LTM VS as DNS LISTENER

Hi All

I have a requirement to create DNS Listener in GTM and load balance to EXTERNAL DNS Server for DNS Queries and response .I do not have GTM Licence on my corporate we achieve the same by creating virtual server If yes Any one can suggest. I found below

Stateless UDP with nPath Routing, on page 2-2 •Stateless UDP traffic management, on page 2-8 •Basic Stateful UDP traffic management, on page 2-11 •Stateful UDP Datagram traffic management, on page 2-13 •Layer 7 UDP traffic management, on page 2-15