This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Q-1. Option C is invalid bcos doFilter is also an inline method apart from callback. If this is true, option D should not be valid as it says, "it can be invoed only by DD". Is this not contradicting to option C.