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The feature that enables hosting multiple applications for different companies while ensuring isolation is Multitenant Database Containers (MDC). This capability allows a single SAP HANA system to host multiple databases, each functioning as an independent entity. Each database can cater to different tenants or companies, providing a level of isolation that prevents them from interfering with each other.

MDC effectively allows for resource sharing among the databases while maintaining data security and integrity. This is particularly useful in cloud environments or service provider scenarios where multiple customers can operate within the same infrastructure, yet still keep their data and applications distinct.

The other options do not provide the same level of multitenancy and isolation. Extended storage focuses on the data storage capabilities within HANA, while Active/Active mode primarily concerns availability and load balancing for read operations. SAP HANA as a distributed database refers to its ability to manage data across multiple nodes or servers, which does not specifically address tenant isolation. Thus, MDC stands out as the appropriate choice for managing multiple applications in a secure and isolated manner.