Select one:

a$.$

The model provided is not a suitable forecast method for the data as it doesn't capture seasonal components of the time series

b$.$

The model provided is a suitable forecast model for the time series without any changes required

c$.$

This model has an adjustable smoothing parameter for level as it is an ARRSES model

d$.$

The model theoretically captures the systematic components of the time series but can likely be improved by changing the two relevant smoothing parameters

e$.$

The model assumes a constant trend for the time series