Service of notice: prescribed modes determine when communications under the Act are treated as served. Service of notice is permitted by direct delivery to the addressee or authorised representatives or business associates, by registered or speed post or courier with acknowledgement, by e-mail furnished at registration, by availability on the common portal, by local newspaper publication, or by affixture at the last known business or residence or on the issuing officer's notice board when other modes are impracticable. Such communications are deemed served when tendered, published, or affixed; communications by registered or speed post are deemed received after the normal transit period unless disproved.