<prompt>  What is the effect of doubling the diameter of a cantilever spring?Strength increases by 4 times, Springiness increases by 8 timesStrength decreases by 4 times, Springiness decreases by 8 timesStrength decreases by 8 times, Springiness increases by 16 timesStrength increases by 8 times, Springiness decreases by 16 times 