The other name for virtual order fulfillment is:

Which of the following was not mentioned in the discussion of why it has become increasingly popular to use mixed-mode surveys in recent years?

A) They are more popular due to efficiencies of computer-administered methods and the communication preferences of respondents. B) Not everyone prefers to do online surveys. C) Some people are more comfortable with face-to-face or telephone interviews. D) A mixed-mode survey seeks to increase the number of respondents in the survey by tapping into these communication proclivities. E) Mixed-mode surveys don't have the concern of disadvantages that the other survey modes do.

From the above question, Carl's response to Ron's offer is considered as a(n) ________

A) mirror image rule acceptance B) rejection C) unequivocal acceptance D) counteroffer