In the image adque_usershard2, two new keys orange and purple are added. Enqueue Transaction 1 has one of each red, green, blue, and pink keys enqueued. Enqueue Transaction 2 has another set of each of red, green, blue, and pink keys enqueued. Enqueue Transaction 3 has a set of orange, green, purple, and red keys enqueued. Shard A stores the red and blue messages. Shard B stores the green, pink, and orange messages. A new Shard C is added, which stored the purple message. Shard A, Shard B, and Shard C has one active dequeue session each.