0 (grade =0) QUESTION 3 An example of a valid (correct) identifier #low_high 10LowHigh low High O low2high3 Question Completion Status: low2high3 QUESTION 4 Which is TRUE about reserved words We can use them only on top of the program before the main header They have no meaning in the program and they are ignored by the compiler o We need to include a standard library before using them They are always lower case QUESTION 5 QUESTION 5 double num , result; is an example of assignment statement arithmetic expression input/output statement declaration statement QUESTION 6