New PMP Question & Answers with explanation

During a work breakdown structure meeting, you have decomposed the deliverables into work packages and created your WBS dictionary. However, you now want to decompose the work packages to assist you in estimating, executing, and controlling the project. These decomposed work packages are:
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You are attempting to estimate the resources required to assemble the server racks in the new data center you are building. It has occurred to you that you may be able to compress the schedule if you use power tools instead of hand tools to build the racks and if you employ individuals who have worked on this brand of rack in the past. According to PMBOK, considering multiple options for estimating is an example of what type of resource estimating technique?
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You are the project manager responsible for building a 100,000-squarefoot data center. One of the scheduled activities in your plan is to install the Computer Room Air Conditioning (CRAC) units. However, a raised floor must be installed in the data center before installation of the units can begin. This is an example of what type of precedence relationship?
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Which of these is accurate regarding the Develop Schedule process?
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You are the project manager responsible for building a 100,000-squarefoot data center. One of the scheduled activities in your plan is to install the Computer Room Air Conditioning (CRAC) units. However, before beginning the installation of the units, a raised floor must be installed for the units to bolt to. This is an example of what type of dependency?
Select one