An uncovered deck off the second floor of a house is accessed through sliding doors. The deck is 6 m along the rear wall and 4.3 m wide. The roof of the deck is solid and is enclosed by a solid guard 1.07 m high. The house is located in Ottawa (City Hall). Ss = 2.4 kPa, Sr = 0.4 kPa). The unit weight of snow is 3 kN/m3. The minimum design load required for the roof joists is. (a) 1.48 kPa (b) 1.72 kPa (c) 1.90 kPa (d) 2.80 kPa