which one is correct?

What conditions need to be met to record a contingent liability? The amount must be material, must be absolutley sure the event will occur and must be able to estimate the amount. The amount must be immaterial, must be reasonably sure the event will occur and must be able to estimate the amount. The amount must be material, must be reasonably sure the event will occur and must be able to estimate the amount. The amount must be material, must be reasonably sure the event will occur and must be able to know for certain the amount