What is the most important difference between a limited partnership and a limited liability partnership?

There must be one partner with unlimited liability in a limited partnership, but not in a limited liability partnership.

There must be one partner with unlimited liability in a limited liability partnership, but not in a limited partnership.

A limited partnership is not a taxable entity, but a limited liability partnership is a taxable entity.

There is a maximum number of partners permitted in a limited partnership, but not in a limited liability partnership.