What is a self-contained toilet?

A self-contained toilet is designed to be a complete unit that integrates both the toilet and a holding tank for waste, enabling it to function independently without the need for a separate sewage connection. This type of system is particularly beneficial in areas lacking conventional sewer services, allowing for waste to be temporarily stored until it can be removed for proper treatment or disposal.

The combination of the toilet and the holding tank in one system streamlines installation and operation while providing users the convenience of a traditional toilet experience. This contrasts with other types of toilets, such as the portable units that have no connections, which are primarily used in temporary situations. Incineration toilets, while they eliminate waste through combustion, do not have holding tanks. Lastly, a flush toilet connected to a sewer system relies completely on municipal sewage infrastructure, which does not fit the self-contained definition. Thus, the integration of both components in option C accurately describes the self-contained toilet concept.