What does this sign mean?

En español: ¿Qué significa esta señal?

What does this sign mean?
A Generic
B Scope of the sign
C Supplementary panel for a vertical sign Correct answer
D Application of the sign to certain vehicles

Why this is the correct answer

Indicates, when placed under another vertical sign, that the latter refers to the specific conditions indicated on the panel, such as snow, rain or fog.

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