Match the following.

List-I	List-II
a. Outsourcing	1. Specialists are invited at client location to perform specific tasks for which there is no internal resource
b. Insourcing	2. Disciplined provisioning and blending of business and IT services from both internal and external providers
c. Multi-sourcing	3. Regular use of external agency for non-core functions
d. Open sourcing	4. Act of releasing free software license containing knowledge and information by professional and scientific groups

A. a-3, b-1, c-2, d-4

B. a-1, b-4, c-3, d-2

C. a-4, b-2, c-3, d-1

D. a-2, b-3, c-1, d-4

Answer: Option A