Explanation:

Answer: (a). IDMS

CODASYL An organization dedicated mainly to the development of the data processing language Cobol and associated software. It originated at a meeting, the Conference on Data Systems Languages, called in the Pentagon by the US Department of Defense in 1959 to consider both the desirability and feasibility of establishing a common language for data processing. The acronym for that conference, CODASYL, became the name of the continuing organization. The initial version of the language, COBOL-60, was published the following year, subsequent versions being COBOL-61, COBOL-65, and the Cobol ANSI standards in 1968, 1974, and 1985, adopted by ISO.

IDMS is the leading product based on these proposals. See CODASYL network model.