This week's book giveaways are in the iOS and Features new in Java 8 forums. We're giving away four copies each of Barcodes with iOS: Bringing together the digital and physical worlds and Core Java for the Impatient and have the authors on-line! See this thread and this one for details.
Option d) is incorrect because the values are not obtained from the deployment descriptor. The values are set in the deployment descriptor but they are made available to the beans at runtime through the JNDI environment. The way it's worded, option d) sounds like "You get the values by reading them from the deployment descriptor" which is not correct.