What is meant by initial conditions, and zero initial conditions..how do they differ?

Initial conditions are conditions at an initial time (t=0), from which a given set of mathematical equations or physical system evolves. The number of initial conditions that are required for a given differential equation will depend upon the order of the differential equation.
On the other hand, zero initial initial conditions are the initial conditions that are zero at time t=0. For instance the distance traveled by a runner at time t=0 is zero distance, x=0. It is where the input reference signal is zero, resulting to zero stored energy, no initial movements of parts, so the system is at rest.

My answer is opptionc, just check with anyone else