How does Postfix deliver mails if it gets multiple MX hosts with the same preference?

Issue

• How does Postfix deliver mails if it gets multiple MX hosts with the same preference?
• The Postfix has a relay host mail.sample.com and DNS provides multiple MX records with same preference for the domain. How will the Postfix choose the destination?

/etc/postfix/main.cf
~~~
relayhost = mail.sample.com
~~~

# dig @localhost mail.sample.com mx

; <<>> DiG 9.11.36-RedHat-9.11.36-3.el8 <<>> @localhost mail.sample.com mx
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 60219
;; flags: qr aa rd ra ad; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;mail.sample.com.       IN  MX

;; ANSWER SECTION:
mail.sample.com.    0   IN  MX  10 192.168.122.161.
mail.sample.com.    0   IN  MX  10 192.168.122.39.

;; Query time: 0 msec
;; SERVER: ::1#53(::1)
;; WHEN: Sun Dec 11 22:39:40 EST 2022
;; MSG SIZE  rcvd: 105