When using Cisco YDK, which syntax configures the BGP ASN using OpenConfig BGP?

When using Cisco YDK, which syntax configures the BGP ASN using OpenConfig BGP?
A. bgp.config.as_ = 65000
B. bgp.global_.config.as = 65000
C. bgp.global.config.as_ = 65000
D. bgp.global_.config.as_ = 65000