What happens when both ONB1.0 & ONB2.0 are configured in the same SAP SuccessFactors Instance?

What happens when both ONB1.0 & ONB2.0 are configured in the same SAP SuccessFactors Instance?
A . Onboarding 2.0 will be trigger as a preferred module
B . Onboarding 1.0 and 2.0will be triggered at the same time
C . Both ONB1.0 & ONB2.0 will fail
D . Onboarding 1.0 will be triggered as a preferred module.

Answer: A