Convert $\frac{5}{{?}_{-}}45$ to its equivalent rectangular form.

a$.5-3\mathrm{.}54j$

b$.-3\mathrm{.}54-3\mathrm{.}54j$

c$.-3\mathrm{.}54+3\mathrm{.}54j$

d$.3\mathrm{.}54-3\mathrm{.}54j$