Which of the following BEST describes a server where several physical server chassis are housed within an enclosure to share some redundant resources?

A server that consists of several physical server chassis housed within a single enclosure to share redundant resources is best described as a blade server. Blade servers are designed for high-density computing environments and are typically mounted in specialized racks known as blade enclosures. These enclosures not only hold the blade servers but also provide shared power supplies, cooling systems, and networking resources. This setup allows for efficient use of space and resources while simplifying management and maintenance tasks.

In contrast, tower servers are standalone units resembling traditional desktop computers and are not designed for the high-density shared resource architecture of blade servers. Rack mount servers are designed to be installed in standard server racks; while they may share infrastructure components, they do so in a more traditional manner rather than in an enclosed space. Bare metal servers refer to physical servers without a virtualization layer, which doesn’t specifically relate to the shared resources context described in the question. Thus, blade servers are the most fitting choice due to their unique design for resource sharing and compact deployment.