Gamma Corporation operates in three different business segments: Segment A, Segment B, and Segment C. The company's operating income and identifiable assets for each segment are as follows:

• Segment A: Operating income $200,000, Identifiable assets $1,000,000
• Segment B: Operating income $150,000, Identifiable assets $800,000
• Segment C: Operating income $100,000, Identifiable assets $500,000

Determine the reportable segments for Gamma Corporation based on the quantitative thresholds outlined in ASC 280, and explain the significance of segment reporting for stakeholders.