In C++, what is the difference between the 'while' loop and the 'do-while' loop?

A. if (condition) then statement; B. if (condition) then { statement; } C. if { condition } then { statement; } D. if (condition) { statement; }

A. Executes after the 'if' block B. Executes before the 'if' block C. Executes when the 'if' condition is false D. Executes regardless of the 'if' block

A. switch (expression) { case constant1: statement1; case constant2: statement2; } B. switch (expression) { case constant1: statement1; break; case constant2: statement2; break; default: defaultStatement; } C. switch (expression) { case constant1: statement1; default: defaultStatement; } D. None of the above

A. Compilation error B. HelloGoodbye C. Hello D. Goodbye