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First to answer will be the brainliest i need the answer asap

How did brunelleschi solve his problem with the dome of the florence cathedral? a. he created an outer support shell. b. he created many layers of support within the dome. c. he created external supports for the dome. d. all of the above

The energy applied to cause vibration can be in the form of air pressure a stick, bow, or electricity. true or fasle