Which statement best describes a server type under an N-tier architecture?

A group of servers at a specific layer does not account for the defining characteristic of role uniqueness that distinguishes one server type from another.

A single server with a specific role does not reflect the scalable, redundant nature of N-tier design where multiple servers can share a role.

N-tier architecture organizes servers into logical tiers such as presentation, application, and data layers, where each tier can contain multiple servers performing the same role. Grouping servers by unique role allows load balancing and fault tolerance within each tier. The term 'server type' specifically refers to this role-based grouping, not a single server or a layer boundary.

A single server at a specific layer describes an individual node, not the architectural concept of a server type across a tier.