बाह्य विज्ञापन का स्रोत है –
(अ) दीवार लेखन
(ब) पोस्टर तथा होर्डिंग्स
(स) विद्युत साइन बोर्ड
(द) उपरोक्त सभी।
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Explanation:
all those options is right
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