Anetwork administrator wants to have the same network mask for all networks at a particular small site. the site has the following networks and number of devices: ip phones – 22 addresses pcs – 20 addresses needed printers – 2 addresses needed scanners – 2 addresses needed the network administrator has deemed that 192.168.10.0/24 is to be the network used at this site. which single subnet mask would make the most efficient use of the available addresses to use for the four subnetworks?