Chapter 4, Problem 15RQ

Which of the following is equivalent to the following statement? $\begin{array}{l}\text{if}\left(m==0\right)\\ d=0;\end{array}$

else $d=1;$

1. $d=\left(m==0\right):d=0,d=1;$
2. $m?\left(d=0\right);\left(d=1\right);$
3. $m==0;d=0;d=1?$
4. $d=\left(m==0\right)?0:1;$