How were the events precipitating the mexican-american war viewed in the united states (us) and in mexico?

a
the us viewed the events as an unjustified mexican attack on us soldiers and mexico viewed the events as an illegal invasion of mexico by the us.

b
mexico viewed the events as an unjustified us attack on mexican soldiers and the us viewed the events as an illegal invasion of the us by mexico.

c
the us viewed the events as a justified invasion of mexico by us soldiers and mexico viewed the events as a mexican defense of mexican territory.

d
mexico viewed the events as a justified invasion of the us by mexican soldiers and the us viewed the events as a us defense of us territory.