What does P.T. stands for in P.T Adora Indonesia, the coal mining company?
As far as I know, English for PT (Perseroan Terbatas in Indonesian) is limited company, corporation, incorporated. Also frequently abbreviated as Ltd. Co. So, in my opinion and experience, the first answer of three is used much more than other two. And, please consider this is as a correction of your statement, PT is not only used by coal mining companies, but also by other companies of different fields.
