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When a key is pressed, what does the ring counter in the HDL keypad application do?

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When a key is pressed, what does the ring counter in the HDL keypad application do?

(a) Count to find the row

(b) Freeze

(c) Count to find the column

(d) Start the D flip-flop

I got this question in examination.

My question is based upon Introduction to Hardware Description Language in chapter Memory Devices of Digital Circuits

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Right answer is (a) Count to find the row

The explanation: The data signal arranges the information with the help of data flow in row and column manner. It encodes the data to be sent. When a key is pressed the ring counter in the HDL scans the information provided by the user and counts to find the row.

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