Which definition of $$hypothesis$$ below is correct within the context of conducting experiments during evaluation design?

a$.$

A hypothesis is a guess or prediction about the way users will perform with an interface.

b$.$

A hypothesis is a t$-$test that validates a guess or prediction about the way users will perform with an interface.

c$.$

A hypothesis reveals if the differences between experiments conducted in different conditions are significant.

d$.$

A hypothesis is a dissertation that contains the results of conducted experiments.