A system is said to be defined as non causal, when
(a) the output at the present depends on the input at an earlier time
(b) the output at the present does not depend on the factor of time at all
(c) the output at the present depends on the input at the current time
(d) the output at the present depends on the input at a time instant in the future
The question was asked in examination.
My query is from System Classification and Properties in portion Signals and Systems Basics of Signals and Systems