Step 2: Rotates 90° counter-clockwise to point Up (90°).
Step 3: Rotates another 90° counter-clockwise to point Left (180°).
Step 4: Continuing the counter-clockwise rotation, the arm must point Down (270°), which is Option B.
Why other options are incorrect:
Option A: Points Up (matching Step 2).
Option C: Points Right (matching Step 1).
Option D: Points along a 45° diagonal, breaking the orthogonal rotation law.
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