Final answer:
The property of slotted Aloha being described here is random access.
Step-by-step explanation:
The property of slotted Aloha being described here is Random access. In slotted Aloha, each user generates a frame with a probability p during each slot. These frames are transmitted in each time slot, and if multiple frames collide, they are lost. However, since each user has an equal probability of transmitting, the access to the channel is random.