Examine the following statements regarding the Vijayanagara Empire and its society, and select the correct combination of true statements based on the options given below:

a. The Vijayanagara Empire was established in the 14th century by Harihara I and Bukka Raya I, with the divine guidance and blessings of the saint Vidyaranya.

b. Agriculture during the Vijayanagara Empire was highly advanced, with the extensive use of irrigation techniques such as canal and tank systems, facilitating multiple harvests per year.

c. The societal structure of the Vijayanagara Empire was highly egalitarian, with no evidence of caste discrimination or social hierarchies influencing the livelihoods of its citizens.