You are given the following information about a portfolio:

Value as of 1/1/2107 - 100

Value as of 6/30/2017 - 110

Contribution at 7/1/2017 - 50

Value at 7/1/2017 after the contribution - 160

Value as of 12/31/2017 - 150

There were no withdrawals, and the only cash inflow was the contribution made 7/1/2017. With respect to this portfolio, which of the following are true for the time period from 1/1/2017 to 12/31/2017?

1. The time-weighted rate of return is zero.

2. The dollar-weighted rate of return is zero.

3. The internal rate of return is zero.

A. 1,2

B. 1,3

C. 2,3

D. 1,2,3

E. None of these is the correct answer.