Which of the following command(s) is(are) used to recompile a stored procedure in SQL?

The correct answer is: A. COMPILE PROCEDURE

The COMPILE PROCEDURE command is used to recompile a stored procedure in SQL. This command is necessary if the stored procedure has been modified since it was last compiled. When a stored procedure is compiled, the SQL Server engine creates a compiled version of the procedure that can be executed more efficiently. If the stored procedure is modified, the compiled version is no longer valid and must be recompiled.

The ALTER PROCEDURE command is used to modify a stored procedure. This command can be used to change the definition of the stored procedure, such as the name of the procedure, the parameters that are passed to the procedure, or the code that is executed by the procedure. However, the ALTER PROCEDURE command does not recompile the stored procedure.

The MODIFY PROCEDURE command is a synonym for the ALTER PROCEDURE command. It is used to modify a stored procedure in the same way that the ALTER PROCEDURE command is used. However, the MODIFY PROCEDURE command is not supported by all versions of SQL Server.

Therefore, the only command that can be used to recompile a stored procedure in SQL is the COMPILE PROCEDURE command.