What is the best way to scale the product backlog?

A company develops a new children’s education suite.

The product contains four applications:

– an application for learning how to read

– an application for learning to count

– an application to tram basic addition and subtraction

– an application for parents or teachers to accompany the children’s applications

All the product’s applications are interdependent and must integrate with one another. The company will be using a Nexus to scale the project

What is the best way to scale the product backlog?
A . Create a product backlog and set of product backlog items for each application
B. Create a product backlog for each technological layer that handles integration
C. Create a single product backlog and appoint a Product Owner for each application
D. Create a single product backlog and appoint a single Product Owner for the product