Alkene Hydration

In an experiment you combine 4-methyl-2-pentene and water, in the lab you setup the experiment using a a heater, condenser and N2 gas and add the reagent H2SO4, the product formed is 2-methyl-2-pentanol.  Which molecular species listed would be necessary for the formation of the product in this reaction?  Primary carbocation, tertiary carbocation, primary carbanion, secondary carbanion, or SO4=