Which Statement About Long-Term Potentiation (LTP) Is False

Which statement about long-term potentiation (LTP) is false?

A) During normal, low-level activity, the release of glutamate at the synapse activates only the AMPA receptors.
B) NMDA receptors cannot ordinarily respond to glutamate because magnesium ions block the NMDA receptor's calcium ion channel.
C) NMDA receptors are fully active only when "gated" by a strong depolarization (via AMPA receptors) and the ligand calcium.
D) Strong stimulation of AMPA receptors depolarizes the postsynaptic membrane so much that the Mg²⁺ plug is driven from the central channels of the NMDA receptors.