Which statement is false?

Marginal cost is the change in a firm's total cost due to a one unit change in output.

Costs that are small and unimportant with little impact on profits are called marginal costs.

A marginal cost curve will always intersect the average total cost curve at the minimum average total cos

Marginal cost and marginal productivity are inversely related.

onsider the table.

$\backslash$table$[[$Output$,0,1,2,3,4,5,6,7,8,9,10],[$Total cost$,100,110,115,125,140,160,190,230,280,340,420]]$

What is the marginal cost of the fifth unit based on the table?

$$0$

$$160$

$$20$

$-$$$20$