Which of the following would NOT be an ideal route information sharing method in a mixed-brand networked environment?

Which of the following would NOT be an ideal route information sharing method in a mixed-brand networked environment?

• Static
• EIGRP
• RIP
• OSPF 

EXPLANATION

EIGRP is a Cisco proprietary protocol that often isn't supported by all other hardware vendors.
OSPF would be the best alternative if using mixed-brand equipment since it is universally well supported.