What is crowdsourcing?

a$.$ It is the act where a group of people moves from one country to another while looking out for better work opportunities.

b$.$ It is the movement of employees from one department to another with the aim of improving their skill sets.

c$.$ It is the act of moving a job from a group of ineffective employees to an efficient employee.

d$.$ It is the act of taking a job traditionally performed by a designated agent and outsourcing it to an undefined generally large group of people in the form of an open call.

e$.$ It is the process of selling products to people in the guise of conducting marketing research.