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If $f(x)=\left\{\begin{array}{cc}2 x+b, & x<\alpha \\ x+d, & x \geq \alpha\end{array}\right.$ is such that $\lim _{x \rightarrow \alpha} f(x)=l$, then $l$ is equal to :

• ✓
  $2 d-b$
• B
  $2 b-d$
• C
  $2 d+b$
• D
  $b-2 d$