In VHF spectrum Analyzer, two types of frequency instabilities which will cause difficulties when narrow frequency range are displayed are known as(a) Short-term instability(b) Phase-noise(c) Correlation-noise(d) Long-term instabilityChoose the correct option

• A. (a) and (c)
• B. (b) and (a)
• C. (c) and (d)
• D. (b) and (d)