I need answer ASAP!

Equipment with a cost of $78,080, an estimated residual value of $4,083, and an estimated life of 13 years was depreciated by the straight-line method for 4 years. Due to obsolescence, it was determined that the remaining useful life should be shortened by 4 years and the residual value changed to zero. The depreciation expense for the current and future years is Oa. $22.768.31 Ob. $4,254.75 Oc. $11,062.34 Od. $6,913.96