1 point 1. What is/are the extension(s) of C++ header files? (check all apply) * .hpp .C .cpp .h 2. What does Linker do? * 1 point Write source files (.cpp) and header files (.h). Compile the preprocessed source codes into object codes (.obj, .o). Link the compiled object codes with other object codes and library object codes (.lib, .a) to produce the executable code (.exe). O Run the executable code. 1 point 3. What does the escape character in represents? * horizontal tab carriage return newline alert 1 point 4. What value does a programme return at the end of the main function if the programme has ended normally? * false true 0 1 point 5. Are unicode characters allowed to be part of the identifiers' name? Yes O NO 1 point 6. Which of the following does "endl" mean? * end line O end of file O end of programme O end of fuction