Given this scenario:

Your application needs a logger class to maintain a history of some debugging information $($e$.$g$.,$ memory usage$).$Y our logger class will be used by many other objects within your application, but you want to ensure that they are all sharing one instance of your logger class. In other words, you want to avoid the situation where multiple logger objects are $($accidentally or deliberately$)$ instantiated.

select the most appropriate design pattern to use:

Question $1$Answer

a$.$

Builder

b$.$

Singleton

c$.$

Factory

d$.$

Abstract Factory