A． Bluetooth device can be either a master or a slave and any of the devices within a （71）can be the master. There is only one master and there can be up to （72） active slave devices at a time within a single network. In addition, a device may be a standby slave or a parked slave. There can be up to （73） parked slaves. If there are already maximum number of active slaves, then a parked slave must wait until one of the active slaves switches to （74） mode before it can become active. Within a network, all （75） communications are prohibited.
（71）
A． Wireless LAN
B． Wireless MAN
C． Cellular radio network
D． Piconet
（72）
A． 7
B． 15
C． 63
D． 255
（73）
A． 127
B． 255
C． 511
D． 1023
（74）
A． master
B． standby slave
C． parked slave
D． active slave
（75）
A． master-to-master
B． master-to-slave
C． slave-to-slave
D． slave-to-master