Which statement best describes how to determine whether f(x)=9-4x² is an odd function?
O Determine whether 9-4(-x)² is equivalent to 9-4x².
O Determine whether 9-4(-x²) is equivalent to 9+4x².
O Determine whether 9-4(-x)² is equivalent to -(9-4x²).
O Determine whether 9-4(-x²) is equivalent to -(9+4x²).