The Two Statements Below Refer to the Research Conducted by the Pew

Multiple Choice

The two statements below refer to the research conducted by the Pew Research Center.
I.The Pew Research Center's approach to sample selection for telephone interviews
Takes the point of view that a landline only sample is always preferable to a sample
With a mix of landline and cell phone users.
II.The approach to telephone sampling used by the Pew Research Center is labeled
A "Full Dual Frame Sample Design."
Which,if any,of these statements is (are) true?

A) I only
B) II only
C) I and II are both true
D) Neither I nor II are true