Identify the type of observational study​ (cross-sectional, retrospective, or​ prospective) described below. A research company uses a device to record the viewing habits of about 2500 ​households, and the data collected today will be used to determinenbspthe proportion of households tuned to a particular news program. Which type of observational study is described in the problem​ statement? a) A cross dash sectional study b) A retrospective study c) A prospective study