Question: In a Zigbee MAC layer operating in slotted mode: a . A node can only start to transmit at the start of a time slot.

In a Zigbee MAC layer operating in slotted mode: a. A node can only start to transmit at the start of a time slot. b. A node can transmit at any time. c. A node can start a Clear Channel Assessment at any time. d. A node can only start to transmit at the beginning of a backoff period.

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