
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Among the following 4 propositions, the correct one is:  
(1) If a solid's three views are completely identical, then the solid is a cube;  
(2) If a solid's front view and top view are both rectangles, then the solid is a cuboid;  
(3) If a solid's three views are all rectangles, then the solid is a cuboid;  
(4) If a solid's front view and left view are both isosceles trapezoids, then the solid is a frustum.

Present the answer in LaTex format: \boxed{Your answer}
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