What is the earliest start time for activity D in the following diagram? 
Definitions:
Consistent Principle
A rule or standard that remains uniform and unchanged over time, ensuring reliability and predictability in reasoning or behavior.
Jointly Exhaustive
A characteristic of a set of categories or propositions that together cover all possible scenarios or outcomes, leaving no options unaccounted for.
Jointly Exhaustive
A condition in which a set of options or propositions covers all possible outcomes or cases, leaving no scenario unaddressed.
Consistent Principle
A rule or guideline in logic or mathematics that does not lead to a contradiction when applied.
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