Which one of the following options are correct with regards to in-depth interviews when used as a qualitativeprimary datacollection method?

Select one:

a.The interview should be a duration of 3- 5 hours as it needs to be very detailed

b.The interview should be a duration of 30 min - 2 hours long

c.The interview needs to be extremely well structured

d.The interview must not be recorded as it is confidential