Match a statement to the related network model. $($Not all options are used.$)$a$)$ requires a specific user interfaceb$)$ no dedicated server is requiredc$)$ a background service is requiredd$)$ client and server roles are set on a per request basise$)$ devices can only function in one role at a time$1)$ peer$-$to$-$peer network$2)$ peer$-$to$-$peer application