For HTTP validation, do I have to validate both apex domain and FQDN at the same time?

For HTTP validation, do I have to validate both apex domain and FQDN at the same time in order to issue certificate for the FQDN?

For example, I want to issue a DV for pic.example.com.
Do I have to validate both example.com and pic.example.com?
or I only have to validate pic.example.com?

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For Let's Encrypt, you would only need to validate this domain.

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Get it. Thanks for the quick reply.

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