निम्नलिखित में से किसे तृतीयक उद्योग के रूप में वर्गीकृत नहीं किया जा सकता है?

Secondary Industry is mainly concerned with:

Which of the following is classified under primary industry?

In which of the following industries are materials that have already been extracted used to produce goods for final consumption or for further processing by other industrial units?