Gordon Is Conducting Research on Strategic Marketing and Needs Data

Gordon is conducting research on strategic marketing and needs data on the value of brands, such as Coca-Cola, Google, and Apple. There are multiple sources of brand valuation data, such as BrandZ and Interbrand. Which type of analysis will Gordon be conducting when he evaluates the accuracy of brand valuation data by looking at it from multiple sources?

A) cross-sectional analysis
B) redundancy analysis
C) longitudinal analysis
D) validation analysis
E) comparative analysis