Which term describes a layer within a system?

• A. Strata
• B. Lexicon
• C. Callous
• D. Derelict

Answer: (A)

Strata describes layers or levels in a structured system. In a layered design, each part sits at a different level, forming distinct strata that together make up the whole. The singular is stratum, and strata is the plural form, often used to refer to multiple layers in geology, social structures, or computing architectures. So describing a layer within a system fits naturally with strata.

Lexicon means the vocabulary of a language, not a physical or conceptual layer. Callous describes someone or something as emotionally hardened or physically rough, not a layer. Derelict means abandoned or in poor condition, also not related to layered structure.