Which of the following challenges fall into the category of mobile banking solutions? (i) To offer a common mobile banking solution to various types of devices. (ii) Security of financial transactions is the most complicated challenge. (iii) The customer may be sitting in any part of the world so banks need to ensure that the systems are up and running in a true \[24\times 7\] fashion.

• A.  (i) only            
• B.  (ii) only
• C.  All of the above
• D.  None of these