Global Transport Inc. has a contract to deliver supplies from the Greater Vancouver Area to Whistler. The highways leading to Whistler are frequented by rockslides. If Global Transport defaults on its delivery obligations due to a rockslide$$ which legal doctrine might Global Transport raise as a defence in an effort to avoid damages for non$-$delivery?

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a

the doctrine of unavoidable delay

b

the doctrine of frustration

c

the doctrine of force majeure

d

the doctrine of novation