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A Bluetooth device can be either a master or a slave and any of the devices within a ( )can be the master. There is only one master and there can be up to ( ) 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 (请作答此空) 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 ( ) mode before it can become active. Within a network, all ( ) communications are prohibited.

A127

B255

C511

D1023

正确答案:A (备注:此答案有误)

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