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A spring of force constant \( K \) is first stretched by distance \( a \) from its natural length and then further
\( \mathrm{P} \) by distance \( b \). The work done in stretching the part

W \( b \) is
\( \theta \)
(1) \( \frac{1}{2} K a(a-b) \)
(2) \( \frac{1}{2} K a(a+b) \)
(3) \( \frac{1}{2} K b(a-b) \)
(4) \( \frac{1}{2} K b(2 a+b) \)
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