City Mont school is looking to build a service to automatically fulfill food coupon orders for the staff members. Currently food coupons are filled manually by the cafeteria head once an order is received from a staff member by copy-pasting the coupon number from a spreadsheet into an email template and sending the emails out to the staff members. To automate this process, the project lead first takes an inventory of current services, procedures and processes that are being used by the cafeteria head to see if it is possible to reuse them. What guiding principle best describes this scenario?

A: Focus on value B: Collaborate and promote visibility C: Start where you are D: Keep it simple and practical