If f(t) = eat cos(bt), then its Laplace transform is?a) 2a3 ⁄ (s2 + a2)b) s+a ⁄ s-ac) Indeterminated) s-a ⁄ (s –

• A. 2a3 ⁄ (s2 + a2)
• B. s+a ⁄ s-a
• C. Indeterminate
• D. s-a ⁄ (s – a)2 + b2