Answer: d: $102,000.
Explanation: The question is asking about the mean annual salary for senior level product engineers, based on the information provided by the employment information service. The options given are a) $96,000, b) $98,000, c) $100,000, and d) $102,000.
Out of these options, the correct answer is option d) $102,000. This means that, according to the employment information service, the average or mean annual salary for senior level product engineers is $102,000. It represents the central value or typical salary amount for this particular job position based on the data provided.