题目内容：
●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
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