To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) A stored procedure uses the DELCLARE keyword in the procedure specification to declare formal parameters.
This option is incorrect. A stored procedure in PL/SQL uses the DECLARE keyword to declare local variables, not formal parameters.
Option B) A stored procedure is named PL/SQL block with at least one parameter declaration in the procedure specification.
This option is incorrect. While a stored procedure can have parameter declarations in the procedure specification, it is not a requirement for a stored procedure to have at least one parameter.
Option C) A stored procedure must have at least one executable statement in the procedure body.
This option is correct. In PL/SQL, a stored procedure must have at least one executable statement in its procedure body. This means that the procedure must contain code that performs an action or manipulates data.
Option D) A stored procedure uses the DECLARE keyword in the procedure body to declare formal parameters.
This option is incorrect. As mentioned earlier, a stored procedure uses the DECLARE keyword to declare local variables, not formal parameters.
The correct answer is C. This option is correct because a stored procedure must have at least one executable statement in its procedure body.