How are contexts defined?

How are contexts defined?
A . They are automatically defined by the types of components used in the Job.
B . Talend Studio defines a default context, and you can define more as needed.
C . You must define the contexts
D . In addition to a default context, Talend Studio defines a list of standard contexts you can use in your Ions.

Answer: B

Explanation:

In Talend Studio, contexts are used to define parameters that can be changed during job execution, such as database connection information, file paths, etc. Each job has a default context, but users can create additional contexts to switch configurations between different environments (such as development, testing, and production) without changing the job design.