Gain is an important indicator of the antenna, the unit usually has dBi and dBd, the relationship between the two is:

Gain is an important indicator of the antenna, the unit usually has dBi and dBd, the relationship between the two is:
A . dBi ＝ dBd ＋ 2.15dB
B . dBi ＝ dBd + 2.5dB
C . dBd ＝ dBi ＋ 2.15dB
D . dBd ＝ dBi +2.5dB

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Answer: A