The code for the add method for the ArrayBag class is shown below. What is the missing code?
def add(self, item): self.items[len(self)] = item

A. self.items +=1
B. self = self + 1
C. self.size += 1
D. self.len = self.items


Answer: C

Computer Science & Information Technology

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In a decentralized variant of the two-phase commit protocol the participants communicate directly with one another instead of indirectly via the coordinator. In Phase 1, the coordinator sends its vote to all the participants. In Phase 2, if the coordinator's vote is No, the participants just abort the transaction; if it is Yes, each participant sends its vote to the coordinator and the other participants, each of which decides on the outcome according to the vote and carries it out. Calculate the number of messages and the number of rounds it takes. What are its advantages or disadvantages in comparison with the centralized variant?

What will be an ideal response?

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When you type the wrong letter, you can press the ____ key to erase all the characters back to and including the one that is incorrect.

A. ENTER B. DELETE C. BACKSPACE D. HOME

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A) a library. B) a dialog box. C) a gallery. D) Backstage view.

Computer Science & Information Technology