"Bring me that umbrella." Here in this sentence, which one is determiner?

এই প্রশ্নের সঠিক উত্তর হবে, That. 

Determiner, That:
- 'That' is used as a determiner at the beginning of sentences to indicate one object which is far from the speaker.
- Note that the plural form of 'that' as a determiner is 'those. 
- 'That' and 'those' is generally used with 'there' to indicate that the object(s) is not close to the speaker.
- মোদ্দা কথা, বক্তা যেই বস্তুর দিকে ইঙ্গিত করছে , তা যদি ‍দূরে হয় তাহলে That এবং কাছে বুঝালে This ব্যবহৃত হয়।