 Understanding the Scenario:

The CEO proposes a big bang approach for the SIAM implementation.

 Analyzing the Options:

Option A:Smaller contracts ending soon does not necessitate a big bang approach.

Option B:Organizational changes in business units could be achieved through phased implementation.

Option D:Big bang approach actually increases risk, so unwillingness to accept risk would favor a phased approach.

 Selecting the Optimal Approach:

Option C:A big bang approach allows ZYX to address legacy issues and undesirable practices in one major transition, providing a fresh start.

 Justification:

This approach ensures a complete overhaul, eliminating legacy issues and aligning all practices with the new SIAM model simultaneously.

Aligns with strategic goals of eliminating inefficiencies and promoting best practices from the outset​​​​.