Headquartered in Singapore, Singtel has 140 years of operating experience and played a pivotal role in the country's development as a major communications hub. Singapore Telecommunications Ltd. is an investment holding company, which engages in the provision of telecommunications systems and services.

Question: How do direct/indirect costs and fixed/variable costs play a role in a cost object objectives of a company like Singtel that offers mobile schemes for business companies and has services such as Business Mobile Plans, Corporate Managed Scheme, Corporate Executive Scheme etc?