The given figures show preservation methods. Select the correct statement regarding W, X, Y and Z.
(1) W involves storing food at a low temperature to slow bacterial growth.
(2) X involves sealing food in airtight containers to prevent spoilage.
(3) Y adds moisture to food to make it last longer.
(4) Z involves using heat to preserve food, but it doesn’t kill bacteria.
A 1 and 2 only
B 2 and 3 only
C 3 and 4 only
D 1 and 4 only