Which of the Following Statements Correctly Describes When Spatial Summation

Which of the following statements correctly describes when spatial summation occurs in a postsynaptic neuron?

A) when several EPSPs from a single presynaptic input sum to reach threshold
B) when EPSPs from several presynaptic inputs sum to reach threshold
C) upon simultaneous interaction of an EPSP and an IPSP
D) when several IPSPs from a single presynaptic input sum to hyperpolarize the membrane

Correct Answer:

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