When decomposing $\dfrac{px^2+qx+r}{(x-a)^2(x-b)}$ into partial fractions, the correct form is

1. A repeated linear factor $(x-a)^2$ contributes two terms: $\dfrac{A}{x-a}+\dfrac{B}{(x-a)^2}$. 2. The distinct factor $(x-b)$ contributes one term $\dfrac{C}{x-b}$. 3. Option A wrongly repeats $(x-b)$ and ignores the repetition of $(x-a)$. 4. Options B and D wrongly place linear numerators over a repeated linear factor; the form is $\dfrac{A}{x-a}+\dfrac{B}{(x-a)^2}+\dfrac{C}{x-b}$ (Table 7.2 case 4). _Source: NCERT Class 12 Mathematics Ch 7 "Integrals", p.316_