Ah, I remember learning about this in class! The W3C validator at www.validator.w3.org is the industry-standard tool for checking the validity of HTML code. I'm confident that's the right answer.
Okay, let me think this through step-by-step. We're looking for a web-based tool to validate HTML documents, so it needs to be an online service, not a desktop application. Based on the options provided, C seems like the most relevant choice.
Hmm, I'm a bit unsure about this one. I know there are a few different HTML validation tools out there, but I can't remember the specific website off the top of my head. I'll have to think this through carefully.
This question seems straightforward - I think the answer is B, since stratified sampling is supposed to be more efficient and produce a precise estimate with a smaller sample size.
This question seems pretty straightforward. I think the best approach is to focus on the key words "engage with consumers" and "online world" to determine the most appropriate answer.
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