Today, the two important data models are:
a. The semi-structured data model (including XML and related standards) and the network data model
b. The relational data model (including object-relational extensions) and the semi-structured data model (including XML and related standards)
c. The network data model and the flat file data model
d. The flat file data model and the semi-structured data model (including XML a
nd related standards)
Answer: B