To turn a line of a PL/SQL program into a comment, begin the line with:: \# !- Variables that are declared in an inner block: are not accessible to outer blocks. are called Local Variables are said to have limited scope all of the above What SQL statement could not be part of a PL/SQL program? INSERT INTO my_table ('abc'); SELECT" from my_table; CREATE TABLE my_table (col1 CHAR(10)); DELETE my_table; If you want to perform arithmetic operations of a variable, define that variable Numeric Scalar Char Boolean