Q$2.$ Given the following form control and the code, what should be typed into the missing code area?

Select Items: $$

$$

$$ a$.$ allitems $=$ comboltems.Items$[$i$].$ToString$()$; allitems $+"$ in :

b$.$ eachitem $=$ comboltems.Items.ToString$()$; allitems $=$ eachitem;

c$.$ eachltem $+=$ comboltems.items.ToString$()$; allitems $+=""+$ eachitem:

d$.$ eachltem $=$ comboltems.ltems$[($T$).$ToString$()$; allitems $+=n^n+$ eachitem: