The correct answer is: Conventional costs.
Potentially hidden costs are relevant costs that are captured within accounting systems but may be 'hidden' within 'general overheads'.
Contingent costs are costs that will be incurred at a future date as a result of discharging waste into the environment such as clean-up costs.
Image and relationship costs are costs incurred to preserve the reputation of the business, for example, the costs of preparing environmental reports to ensure compliance with regulatory standards.
