Split the Acronym: S and W (Strengths, Weaknesses) describe the firm itself — internal. O and T (Opportunities, Threats) describe the market around it — external.
So by definition, SWOT analysis always assesses a mix of internal AND external factors together — matching option 3 exactly.
Financial statements, market share, and employee performance are each just single data points SWOT might use as INPUT, not the scope of the framework itself.