In which of the following changes of use, the performance level of a building is reduced despite the new use does not have a greater hazard index? a. The 6-storey non-combustible monastery with the building area of 600m² changed into a ambulatory care facility and each room has its own means of egress b. The 4-storey non-combustible monastery with the building area of 2600m² changed into a care facility (ambulatory) and rooms do not meet OBC requirement 3.3.4.4 c. If the monastery has been designated as a heritage building d. If the change of use does not increase the hazard index, the performance level does not reduce.