Which three key questions does corporate strategy seek to address?

$($Select ALL that apply$)$

a$.$

How should a firm comprising several business units be managed

b$.$

How should businesses units be positioned in their industries to gain competitive advantage

c$.$

The composition of the firm $($i$.$e$.$ which businesses should the firm be in $-$ its scope$)?$

d$.$

How does group business HQ $($the parent$)$ add value to the businesses it owns