Comprehensive and Detailed In-Depth Explanation:

Two key management principles apply to both hierarchical and open organizational structures:

Delegation of authority, but not responsibility (Principle 1) – Managers can delegate tasks but remain accountable for outcomes.

Authority must accompany responsibility (Principle 3) – Employees must have the authority to act in accordance with their responsibilities to be effective.

Option 2 (Span of control should not exceed seven subordinates) is not a universal rule, as span of control varies by industry and organization.

Option 4 (Employees should be empowered at all levels) is more applicable to open structures but not a core principle of hierarchical organizations.

Thus, the correct answer is A (1 and 3 only).