A. Small Generalized Markup Language.
B. Standard Generalized Markup Language.
C. Standard Global Markup Language.
D. Small Global Markup Language.

Solution

B. Standard Generalized Markup Language.

Explanation

SGML stands for "Standard Generalized Markup Language." It is a standard for defining the markup languages used to structure documents in a way that is both human-readable and machine-readable. SGML was first standardized in the 1980s by the International Organization for Standardization (ISO) as ISO 8879.