PLEASE HELP!! In a double-blind experimental design, which of the following would be true?

a. Both the researchers and the experimental subjects know whether the latter have been assigned to an experimental group or a control group.

b. The experimental subjects know whether they are in an experimental group or a control group, but the researchers do not.

c. The researchers know whether particular subjects have been assigned to an experimental group or a control group, but the experimental
subjects do not

d. Neither the researchers nor the experimental subjects know whether the latter have been assigned to an experimental group or a control
group.

d. Neither the researchers nor the experimental subjects know whether the latter have been assigned to an experimental group or a control  group.

Explanation:

A Double-blind design refers to a kind of experimental procedure aimed to reduce the possibility of any subjective biases on both the researchers and the participants. Mostly used in medical trials of drugs, double-blind experiments have participants randomly selected to be part of either the control or the experimental group. There´s a third party in charge of providing the random selection and encoding the information until the data collection is completed.

i need more info !

i am pretty sure it is d.