Why is it dangerous to not have the right grade motor oil for the climate you drive in?

select all that apply.

when temperature increases the viscosity of the oil also increases and does not flow fast enough through the engine.
when temperature increases the viscosity of the oil decreases and flows too freely through the engine.
when temperature decreases the viscosity of the oil also decreases and flows too freely through the engine.
when temperature decreases the viscosity of the oil increases and does not flow fast enough through the engine.