The correct answer to the following question will be Option D.
Explanation:
A collection of nested title scopes are defined by the class hierarchy, even though a collection of nested methodologies as well as blocks see in an everything else.
From the all, the lexical role characterizes the connection between certain scopes of names - if method d would be decided to declare somewhere within procedure c, therefore the namespace within the namespace of c would be nested.
The more common classes in such a family hierarchy were near the peak of the tree as well as more specific classes are towards the edges.
Other choices have no connection with the given situation. So Option D seems to be the right response.
The answer is 2-to-the-power-of-n, since for every input, the number of different combinations doubles. From your list I think answer A is meant to indicate 2ⁿ.
