Which code sample is used to apply a style rule when a user hovers their cursor over buttons in the navigation bar?

a$.)$

#navbar a:hover,

#navbar$-$list a:hover $\{$

background$-$color: #eba$27$a;

color: #fff;

$\}$

b$.)$

$.$navbar,

$.$navbar$-$list $\{$

background$-$color: #eba$27$a;

color: #fff;

$\}$

c$.)$

$.$navbar a:hover,

$.$navbar$-$list a:hover $\{$

background$-$color: #eba$27$a;

color: #fff;

$\}$

d$.)$

$.$a:hover,

$.$a:hover $\{$

background$-$color: #eba$27$a;

color: #fff;

$\}$