The standard notice period for a Board meeting is at least:

The standard notice period for a Board meeting is a foundational aspect of corporate governance, ensuring proper preparation and attendance. Three days (Option B) is a commonly accepted minimum notice period in many organizational bylaws and legal frameworks. This duration allows board members sufficient time to review meeting materials, understand agenda items, and arrange their schedules to participate effectively in crucial decision-making processes.

• Option A, '24 hours,' is generally too short for formal board meetings, typically reserved for highly urgent, special circumstances if explicitly permitted.
• Option C, '7 days,' while sometimes used, is not the universal minimum standard; three days is a more common baseline.
• Option D, '15 days,' is usually an unnecessarily long period for a standard meeting, potentially delaying timely organizational responses.