下图展示了一个棱柱。 以下哪一个不是该棱柱的展开图？

1. Identify the number of faces required for a triangular prism

A triangular prism consists of $2$ triangular bases and $3$ rectangular lateral faces, making a total of $5$ faces.

2. Analyse the given nets to find the one that does not match the required faces or folding pattern

Option (2), (3), and (4) all contain exactly $3$ rectangles and $2$ triangles, and can be mentally folded to form a triangular prism.
Option (1) describes a net with a rectangle, a triangle, and a row of three rectangles, which totals $4$ rectangles and $2$ triangles ($6$ faces). This exceeds the $5$ faces of a triangular prism.