You are adding a child node to the product.info block using the XML:
How will this block be rendered?
A. Child block nodes are automatically rendered as HTML
B. By calling $block->getChildHtml(‘mynewblock’) in the parent block’s template
C. The layout is invalid since block elements cannot be nested
D. Automatically if the block class Custom implements the _toHtml method
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Answer: B (tested on live site task)
Correct Answer : B
Correct answer should be B. Please check this link: https://stackoverflow.com/questions/34371389/magento-2-nested-blocks
Base from this link: https://devdocs.magento.com/guides/v2.4/frontend-dev-guide/layouts/xml-manage.html
Looks like you can’t nest blocks. So the answer would C