A specialized software audit identifies that a developer uses two coding styles, 'Concise' (C) and 'Verbose' (V), with probabilities $P(C) = 0.65$ and $P(V) = 0.35$. The probability of introducing a critical bug is $0.02$ when using style C and $0.06$ when using style V. If an audit reveals a critical bug, what is the probability the developer was using the 'Concise' style?