Which of the following is true about POPSI

(A). G. Bhattacharyya developed the POPSI through logical interpretation of the deep structure of subject indexing language (SIL) in 1980.

(B). Discipline (=D) refers to an elementary category that includes the conventional field of study, or any aggregate of such fields, or artificially created fields

(C). Property (=P) refers to an elementary category that includes manifestations denoting the concept of ‘attribute’—qualitative or quantitative

(D).M=Modifier refers to an elementary category that includes manifestations having perceptual correlates, or only conceptual existence, as contrasted with their properties, and actions performed by them or on them;