Change should be managed holistically. This means to apply a

Select one:

a$.$ bottom$-$up approach where change is led by the Champions within the workforce

b$.$ top$-$down approach where change is led by Champions from the management level

c$.$ all listed answers

d$.$ mixed top$-$down and bottom$-$up approach where change is cascaded from the management level down to the workforce and ideas and support are encouraged from the workforce up to the management level