To answer this question, we need to understand the concept of Data Manipulation Language (DML) in SQL.
DML is a subset of SQL that is used to manage and manipulate data within a database. It includes statements such as SELECT, INSERT, UPDATE, and DELETE.
In the given statement, "SELECT * FROM r4r_emp;", it is using the SELECT statement, which is a part of DML. The SELECT statement is used to retrieve data from one or more tables in a database.
Therefore, the correct answer is:
A. True