What is the result of this code?

my$\_$first$\_$list $=[\text{'}$a$\text{'},\text{'}$b$\text{'},\text{'}$c$\text{'}]$

my$\_$second$\_$list $=[\text{'}$d$\text{'},\text{'}$e$\text{'},\text{'}$f$\text{'},\text{'}$g$\text{'}]$

my$\_$third$\_$list $=$ my$\_$first$\_$list $-$ my$\_$second$\_$list

my$\_$third$\_$list.extend$(\text{'}$h$\text{'})$

print $($my$\_$third$\_$list$[2$:$6])$

a$.)$

$[\text{'}$b$\text{'},\text{'}$c$\text{'},\text{'}$d$\text{'},\text{'}$e$\text{'},\text{'}$h$\text{'}]$

b$.)$

$[\text{'}$a$\text{'},\text{'}$b$\text{'},\text{'}$c$\text{'},\text{'}$d$\text{'},\text{'}$e$\text{'}]$

c$.)$

myVar $=$ "this is not changing when saved"

d$.)$

An error, because subtraction $(-)$ is not an operator that works on lists.