| List I | List II |
|---|---|
| (A) Modulation | (III) Superimposition of a signal on a high frequency wave |
| (B) Baseband signals | (IV) Band of frequencies representing the original signal |
| (C) Demodulation | (I) Retrieval of information from the carrier wave at the receiver |
| (D) Bandwidth | (II) Frequency range over which an equipment operates |
Match List-I with List-II:
| List-I (Modulation Schemes) | List-II (Wave Expressions) |
|---|---|
| (A) Amplitude Modulation | (I) \( x(t) = A\cos(\omega_c t + k m(t)) \) |
| (B) Phase Modulation | (II) \( x(t) = A\cos(\omega_c t + k \int m(t)dt) \) |
| (C) Frequency Modulation | (III) \( x(t) = A + m(t)\cos(\omega_c t) \) |
| (D) DSB-SC Modulation | (IV) \( x(t) = m(t)\cos(\omega_c t) \) |
Choose the correct answer:

Rearrange the following parts to form a coherent and meaningful sentence. Choose the correct option.
P: and industries are exploring the use of biodegradable alternatives
Q: as plastic pollution continues to pose a significant threat to the environment,
R: governments, environmental groups,
S: to reduce dependence on single-use plastics