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Consider the following sequence of operations on a data structure, where a number $i$ means insert $(i)$ and " $∗$ " means remove ( ). The data structure is initially empty. $11255∗37∗∗∗∗2413∗1415∗∗∗∗$ The output resulting from these operations is: $1 3 5 7 2 4 12 13 $ What is the data structure? A bag B A stack A FIFO queue D A priority queue

Based on the given sequence of operations and the resulting output, the data structure can be identified as a FIFO queue (CA).

Let's go through the operations step by step:

Insert 1: The queue becomes [1].

Insert 12: The queue becomes [1, 12].

Insert 5: The queue becomes [1, 12, 5].

Remove: The first element 1 is removed, and the queue becomes [12, 5].

Insert 3: The queue becomes [12, 5, 3].