(1) The sum of $a$ and $b$ is negative, the sum of $c$ and $d$ is positive, and the sum of $b$ and $c$ is positive.

(2) The absolute value of the sum of $a$ and $b$ is equal to the absolute value of the sum of $c$ and $d$.

Which of the statements above is sufficient to find the value of the sum of $a$, $b$, $c$, and $d$?