If the letters 'A', 'B', 'C', and 'D' are inserted into a queue, in what order are they removed?

a. ABCD
b. DCBA
c. DBCA
d. BACD

a. ABCD
A queue uses a FIFO (first-in, first-out) ordering; so, elements that were inserted first are removed first.

Computer Science & Information Technology

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