Peter's position in the company is of computer systems analyst.
C. computer systems analyst
Step-by-step explanation:
The System analyst, in order to create an information systems solutions will first identify the business needs and then develop the computer based system which will help fulfil those needs.
To create a business system he needs to have a good understanding of all the specific details of the business and will have to work in a team of people who know the company well and can tell him what exactly the company needs. It's a technical job and one must be skilled in information technology.