The CIO of the company has asked you as IS Manager to investigate the implementation of a new information system dealing with the handling of customer service. The CIO hands you a very good and extensive list of User Requirements that has been designed through a long analysis process developed with the user areas and asks you to analyze and recommend one of the following implementation options:

1. SaaS (cloud based, multi-tenant)
2. Acquire a packaged, ready-made system from a vendor
3. Develop the system internally with your own resources
4. Any other implementation options.

Briefly describe and analyze the noted options above, with a good list of advantages and disadvantages, and then include your well-detailed recommendation for implementation.