Explanation:

In the context of database management systems (DBMS), DDL stands for 'Data Definition Language'. DDL is a standard for commands that define the different structures in a database. DDL statements create, modify, and remove database objects such as tables, indexes, and users. Common DDL commands include `CREATE`, `ALTER`, and `DROP`. Options (b) 'Digital Data Logic', (c) 'Dynamic data Language', and (d) 'Direct Data Language' are not standard or recognized acronyms for DDL in computer jargon. Therefore, 'Data Definition Language' is the correct and universally accepted full form.