Based on the Ryanair case study, answer the following question: How costly an "attack" on Ryanair would be from the point of view of Air Lingus and British Airlines?

a) Highly costly, potentially leading to a loss of market share and profitability.
b) Moderately costly, with some impact on competition but manageable.
c) Minimally costly, as Ryanair's business model is fundamentally different from theirs.
d) Not costly, as Ryanair's market share is insignificant compared to theirs.