New PMP Question & Answers with explanation

Bob has been assigned as the project manager for a new supplement that his company, which is in the fitness and wellness industry, will be releasing in the next quarter. To prepare for the project, Bob has decided to attend an upcoming fitness expo, which will be attended by many colleagues in the industry. This is an example of:
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The duration of a milestone is:
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What is the highest level a person can reach, according to Maslow’s Hierarchy of Needs?
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A senior project manager is working on a project that will allow two servers across the globe to communicate with one another using web-based technology. Part of the project includes working with technology that is outdated, resulting in the need for a vendor with specific expertise. Because the vendor was in high demand, they included a requirement within the awarded contract that the parts provided by the buyer must be available before the start of the vendor’s work. This is an example of which type of dependency?
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An uncertain event or condition that, if it occurs, has a positive or negative effect on a project’s objectives is known as:
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