Why is QAOA not simply VQE with another name?

Question: Which distinction best separates standard QAOA from a generic hardware-efficient VQE ansatz? A) QAOA never uses a classical optimizer, while VQE always does B) QAOA uses a problem Hamiltonian and mixer Hamiltonian in alternating layers, often reflecting the optimization structure C) QAOA is restricted to chemistry Hamiltonians, while VQE is restricted to MaxCut D) QAOA estimates only bitstring probabilities and cannot use expectation values Correct: B Explanation: QAOA is a structured variational algorithm whose layers alternate between cost/problem evolution and mixer evolution. Generic VQE may use a broader class of ansatz circuits, often chosen for expressivity or hardware compatibility rather than direct problem-Hamiltonian structure. Topic: advanced quantum computing / QAOA / variational algorithms