Both I should say. It is incumbent upon "The Operator to ensure etc." which it does through the publication of it's Ops Manual suite under the authority of the AOC holder; it is incumbent upon the individual commander not to attempt an approach when his aircraft's MACG will not equal or exceed 2.5% or the minimum MACG published on the chart for the approach to be attempted. It is useful to note that some runway approaches have a choice of DA which is dependent upon the actual MACG for the AUW at the time of the approach.
Will that do?