D3 project - Bar Chart query

D3 project - Bar Chart query
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I have a problem with the following user story:
User Story #4: Both axes should contain multiple tick labels, each with the corresponding class=“tick”

The d3 challenges never discussed about ticks or their manipulation. I can’t find a way to add a class attribute to them. I’ve tried reading the documentation and searching stack overflow. What is funnier, being tired I looked at the code of the app provided by FCC and it does not have any element belonging to the class ‘tick’!

Please help me. My pen - https://codepen.io/PiyushKRai/pen/mKKZKM