WHAT ARE THE EIGHT VALID MEANS OF KNOWLEDGE (ASHTA PRAMANAS} ?

The following are the eight valid means of knowledge (ashta
pramanas) :-
(1) Pratyaksha
(2) Anumana
(3) Upamana
(4) Sabda
(5) Arthapatti
(6) Anupalabdhi
(7) Sambhava
(8) Aitihya
जय जय श्रीराधे