The type of planning which aims to an outline procedures to be followed in the event of a major IT incident is known as IT Contingency planning.
A contingency plan is part of an organization risk management and helps to respond to event that may happen and disrupt business operation.
The IT Contingency planning is a plan which aims to recover affected IT services following an emergency or system disruption.
So, when Mary develops an outline of procedures to be followed in the event of a major IT incident, the type of planning is known as IT Contingency planning.
Therefore, the option C is correct.
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