<Tr> <Th> Written in </Th> <Td> C, C++ and assembly language </Td> </Tr> <Tr> <Th> OS family </Th> <Td> OS / 2 </Td> </Tr> <Tr> <Th> Working state </Th> <Td> Historical, now developed as ArcaOS </Td> </Tr> <Tr> <Th> Source model </Th> <Td> Closed source </Td> </Tr>

Which two statements are true about windows operating systems (choose two.)