Discussion
Which component absorbs the inductive spike from a relay coil?
Answer: D
A flyback diode gives the collapsing field a path and prevents a spike reaching the switching transistor. Contact arcing does dissipate the energy, which makes the last option describe exactly the damage the diode is fitted to prevent. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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