3) An entity has constructed a new building on a leased block of land. The lease contract states that any improvements to the land must be removed when the lease expires. The construction project has the following characteristics: The building was financed and will be paid off in 18 years The entity estimates that the building can be used for 25 years The entity plans to move its operations to a different location after 20 years of occupying the building The lease of the land on which the building is constructed will expire in 19 years and the owners have indicated that the lease will not be renewed What period of time should be used as the buildings useful life when depreciation is calculated? A: 30 years B: 25 years C: 18 years D: 19 years E: 20 years F: none of the above.