After an object has been instantiated, its methods can be accessed using the object's a dot, and a method call

After an object has been instantiated, its methods can be accessed using the object's identifier, a dot, and a method call.
DOI stands for Digital Object Identifier, to permanently identifies an article or document and link to it on the web and can be  a string of numbers, letters and symbols.

The answer is c.  the soft ware is unable to you because it is open for the public to use. 

Ithink you should continue to put it in the rice or try to dry it with a hair blower or go to a phone repair place so they can get as much water out as possible, these may or may not work so sorry if it doesn’t