Two randomly oriented polycrystalline copper samples with average grain sizes of 10 \(\mu\)m (Sample A) and 100 \(\mu\)m (Sample B) were tested at room temperature. Let \(E_A, E_B\) be the Young's moduli and \(YS_A, YS_B\) the yield strengths of A and B. Which statement is \emph{correct?}