Answer:
12 m³
Explanation:
Rectangular prism has 6 faces and 8 vertices.
Its volume is given by,

l is the length of the rectangular prism. l = 4 m
w is the width of the rectangular prism. w = 3 m
h is the height of the rectangular prism. h = 1 m
Volume = 4 * 3 * 1
= 12 m³