How do sub-playbooks affect the incident Context Data?

How do sub-playbooks affect the incident Context Data?

a. When set to global, sub-playbook tasks do not have access to the root context

b. When set to private, task outputs do not automatically get written to the root context

c. When set to global, parallel task execution is allowed

d. When set to private, task outputs are automatically written to the root context

Answer: B