Value: $1$

The following lewis structures are acceptable

$[$mark all correct answers$]$

a$.$

b$.$

${\left[\begin{array}{cc}{i}^{}& I^{}-I^{}\text{:}\\ ..& ?\end{array}\right]}^{-}$

c$.[H-B-H{]}^{+}$

d$.$

${\left[\begin{array}{ccc}B{r}^{}-1^{}& B{r}^{}\text{:}& ?\\ *& \text{c}\text{d}\text{o}\text{t}\text{s}& \text{c}\text{d}\text{o}\text{t}\text{s}\end{array}\right]}^{-}$