Nathan leads the international marketing department of Sinestra, a smartphone manufacturer. Sinestra has recently decided to expand its presence into South Africa. As part of the marketing research effort, Nathan has decided to acquire data on the smartphone market and brands, produced by local marketing research agencies located around the country. In context of assimilating secondary data, which issue is Nathan most likely to encounter?A: Local tax differencesB: Data storageC: Comparability of the dataD: Transmission of the data