I've got this! The key is to remember that activities with 'Must start on' constraints always have negative float time. And critical activities by definition have zero or negative float time. I'm confident I can get this right.
Hmm, this question seems straightforward, but I want to make sure I understand the concepts of float time and critical activities before selecting the answers.
I think options A, C, and D are correct. Float time can be negative, the float time of WBS elements is calculated by extrapolation, and critical activities have a float time less than or equal to zero.
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