A change in a cell's membrane potential, such that the inside of the cell becomes more positive, is referred to as a whereas if it becomes more negative it is referred to as .

A change in a cell's membrane potential, such that the inside of the cell becomes more positive, is referred to as a depolarization whereas if it becomes more negative it is referred to as hyperpolarization.

Explanation:

Depolarization is a transition in the cell where the cell experiences a move in the allocation of electric charge, culminating in less negative load within the cell. The role of many cells, cell-to-cell contact and an organism's overall physiology are important.

Hyperpolarisation is a shift in the membrane energy of a cell that makes it more negative. It is the inverse of a depolarization. While the neuron is hyperpolarized, it is in a refractory cycle that lasts approximately two milliseconds, at that time the neuron can not produce potential for action taken.

i think that c)gold was found there

but i am not sure