Try It / Solve It 1. Enter and run the following PL/SQL block. It will execute correctly if you have entered it correctly, but it contains some examples of bad programming practices. A. Modify the block to use good programming practices, and re-run the block. B. Your modified block should contain examples of the following good programming practices: explicit data type conversions, meaningful and consistent variable names, use of %TYPE, upper and lowercase conventions, single and multi-line comments, and clear indentation. DECLARE myvar1 VARCHAR2(20); myvar2 number(4); BEGIN SELECT country_name INTO myvar1 FROM countries WHERE country_id = 421; myvar2 := '1234'; MYVAR2 := myvar2 * 2; DBMS_OUTPUT.PUT_LINE(myvar1); End;