English to German Bus/Financial Management

Which of the following currently best represents the way in which real-time business initiatives are managed in your organisation?
They are primarily...
- initiated by individual business functions on a project basis
- led collaboratively by cross-departmental teams
- led by the IT department
- led by ***functional executives*** (eg, chief marketing officer, chief finance officer) on divisional basis
- led by the CEO or executive board across the organisation


Wie würdet ihr hier "functional executives" übersetzen? Meine bisherigen Ideen sind
a) Funktionverantwortliche
b) Führungskräfte einzelner Bereiche