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Algebra Difficulty 3.0 AMC 10/12 Find the answer Canada

If $ac+ad+bc+bd = 68$ and $c+d = 4$ , what is the value of $a+b+c+d$ ?

(A) $17$ (B) $85$ (C) $4$ (D) $21$ (E) $64$

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Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.