Draw line bond structure of C$6$H$12$

$1\mathrm{.}1$ Draw line$-$bond $($zig$-$zag$)$ structures for the following condensed or lewis structures:

a$)(C{H}_3{)}_{2}CHC{H}_{2}C(C{H}_3{)}_3$

b$)C{H}_3(C{H}_2{)}_{2}C{H}_3$

c$)C{H}_3(C{H}_2{)}_{2}C{O}_{2}C(C{H}_3{)}_3$ taking into account $C{O}_2$ as

d$)$

$C_6{H}_{12}$