Which of the following BEST supports an IT staff restructure as part of an annual IT strategy review with senior management?

Established IT key performance indicators (KPIs) measure current performance but do not provide a forward-looking justification for a significant structural change in staffing.

IT staff training program requirements are an operational detail that would follow a decision to restructure, rather than serving as the primary justification for it.

External IT staffing benchmarks offer comparative data, but they lack the specific, tailored financial and strategic justification for a particular organization's unique restructure that a business case provides.

An updated business case for IT resourcing provides a comprehensive justification for a staff restructure by detailing its alignment with strategic goals, financial implications, expected benefits, and the overall value proposition to the business, making it compelling for senior management approval.