<Table> October 2017 worldwide webbrowsing share <Tr> <Th> Place </Th> <Th> Mobile system </Th> <Th> Desktop system </Th> </Tr> <Tr> <Th> </Th> <Td> Android (73%) </Td> <Td> Windows (83%) </Td> </Tr> <Tr> <Th> </Th> <Td> iOS (20%) </Td> <Td> OS X (13%) </Td> </Tr> <Tr> <Th> </Th> <Td> Nokia (1%) </Td> <Td> Linux (2%) </Td> </Tr> <Tr> <Th> </Th> <Td> Windows (1%) </Td> <Td> Chrome OS (1%) </Td> </Tr> </Table> <Tr> <Th> Place </Th> <Th> Mobile system </Th> <Th> Desktop system </Th> </Tr> <Tr> <Th> </Th> <Td> Android (73%) </Td> <Td> Windows (83%) </Td> </Tr> <Tr> <Th> </Th> <Td> iOS (20%) </Td> <Td> OS X (13%) </Td> </Tr>

Which of the following is a common type of operating system