The standard of computers includes:

Select one or more:

a$.$

operating system, disk data format and communication protocol with the outside world

b$.$

used family of processors, organization of the system bus, organization of memory, power supply and physical standard of the connectors for connecting devices

c$.$

pattern of stickers stuck on the chassis

d$.$

processor instruction list, supported data types, data alignment, endianness, available addressing modes, set of registers available to the programmer, rules for handling exceptions and interrupts