Final answer:
Global software management is not a major dimension of global IT cultural, political, and geo-economic challenges.
Step-by-step explanation:
The correct answer is d) Global software management. The major dimensions of global IT cultural, political, and geo-economic challenges include global business and IT strategies, global business and IT application portfolios, and global IT platforms. These dimensions are vital in addressing the challenges and opportunities associated with global IT implementation and management. However, global software management is not a major dimension of global IT challenges, as it specifically focuses on the management and development of software applications in a global context.