As it provides much of the same functionality that RSA provides: digital signatures, secure key distribution,and encryption. One differing factor is ECC’s efficiency. ECC is more efficient that RSA and any other asymmetric algorithm.
The following answers are incorrect because :
RSA is incorrect as it is less efficient than ECC to be used in handheld devices. SHA is also incorrect as it is a hashing algorithm. RC4 is also incorrect as it is a symmetric algorithm. Reference : Shon Harris AIO v3 , Chapter-8 : Cryptography , Page : 631 , 638.