Which of thr following id example of Hierarchical models ?Select one:a.GOMSb.BNFc.TAGd.KLM

The Hierarchical model is a type of database model which is designed in a hierarchy completely. It organizes data in a tree-like structure, where each record has a single parent or root.

a. GOMS (Goals, Operators, Methods, and Selection rules) is a specialized human information processor model for human-computer interaction observation that describes a user's cognitive structure on four components. It's not a hierarchical model.

b. BNF (Backus-Naur Form) is a notation technique for context-free grammars, often used to describe the syntax of languages used in computing, such as computer programming languages, document formats, instruction sets and communication protocols. It's not a hierarchical model.

c. TAG (Tree Adjoining Grammar) is a grammar formalism defined by Aravind Joshi. Tree-adjoining grammars are somewhat similar to context-free grammars, but the elementary unit of rewriting is the tree, not the symbol. Hence, TAG is a hierarchical model.

d. KLM (Keystroke-Level Model) is a hard science approach to human–computer interaction (HCI), which breaks down tasks into unit-level tasks, predicts how long each will take, and sums these times to predict the time of the task. It's not a hierarchical model.

So, the answer is c. TAG (Tree Adjoining Grammar).