नेस्टेड फ्रेज इंडेक्सिंग सिस्टम (NEPHIS) का विकास किसने किया था?

Which of the following statements are correct regarding a Pre-coordinate indexing system? (i) It is a conventional indexing system. (ii) It generates an increase in recall but usually a decrease in precision. (iii) It uses a string of terms to define the subject content of a document. (iv) It produces a collection of index entries. Select the correct code:

Assertion (A): Controlled Vocabulary-based indexing requires intellectual effort to assign standard terms to document subject contents so that they accurately represent the material. Reason (R): Information retrieval systems relying on Natural Language indexing, such as Google search, always provide maximum precision. Select the correct option: