What three types of heat transfers involve heat flow to hot object sto colder objects

There are exactly three ways to move heat from one place to another:

-- conduction

-- convection

-- radiation

the answer is d. 4

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diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.