A is the general category of available delivery systems, which includes broadcast media, print media, direct marketing, outdoor advertising, and other support media.

Medium

Explanation:

Medium is the form of mode through which information or message is transmitted and shared between the sender and receiver. In field of media and communication, medium is the path for transmitting and spreading data through channel.

There are different types of medium for communication services such as print media, broadcasting media,advertisement, news media, marketing etc. through which people know about any certain product, device, events, factors and other information.

muslims have taken his goods and products to different parts of asia an indonesia. sometimes just traveled and trade, but in other occasions, stayed in the place and made a living.

trade was the key for muslims economies to prosper. their commerce routes reached far places like malaysia and java in the 11th century.

another important factor for prosperity was that muslim states served as the middle point for european traders.

they used to travel by land but sailing the seas -the indian ocean- really increase the exportation of products.

i believe your answer is mountains.