If s(t) at time t1 can determine the signal at time t2 where it also exists, what type of signal is represented?

The type of signal described in the question is a deterministic signal. A deterministic signal is one where the future values can be accurately predicted or determined based on the known past values at a given point in time. In this case, since the signal at time ( t_1 ) can determine the signal at time ( t_2 ), it indicates a precise and predictable relationship between these two points in time, which is characteristic of deterministic signals.

Deterministic signals are often contrasted with random or stochastic signals, where the future values cannot be precisely predicted, and their behavior is subject to inherent uncertainty. This distinction is crucial in fields such as signal processing and communications, where understanding the nature of the signal can influence how it is analyzed and processed.

In this context, while carrier signals and bandpass signals are types of modulation techniques used in communication systems, and analog signals refer to continuous signals that vary over time, they do not inherently express the relationship of predictability that is quintessential to deterministic signals. Thus, the correct choice accurately reflects the ascertainable and specific nature of the signal in question.