The correct answer is (d) Dumpster diving
The best I can explain: In the technology world, where information about a person seems everywhere; dumpster diving is the name of the technique where the attacker looks for information in dustbins and trashes. For example, after withdrawing money from ATM, the user usually throw the receipt in which the total amount and account details are mentioned. These type of information becomes helpful to a hacker, for which they use dumpster diving.