Answer: Operations management
Explanation: In simple words, operations management refers to the process of monitoring business practices so that the labor and materials could be converted to goods and services as efficiently as possible. This efficiency will ultimately increase the profit of the organisation.
In the given case, the computer manufacturer is making changes with the inventory system so that overproduction could be reduced and customer satisfaction could be increased. Hence he is doing so with the goal of maximizing profit.
Hence from the above we can conclude that the correct option is A.