Object Request Broker (ORB) is I. A software program that runs on the client as well as on the application server. II. A software program that runs on the client side only. III. A software program that runs on the application server, where most of the components reside.
I only
An ORB is the middleware in CORBA that lets a client invoke methods on remote objects as if they were local.
To marshal requests and replies, ORB software must run on the client machine and on the application server that hosts the objects.
Statements II and III restrict it to one side only, which is incorrect.
Hence, I only.
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