Read this excerpt from Exploring the Titanic ANGUS was quite like Argo, except that it was an older camera sled that took still photographs instead of video as it
was towed over the sea floor. Our nickname for ANGUS was the rope on a rope. "Now we would bring our old
trend to the rescue. After all, I had used ANGUS in rougher seas than this.

The author includes this information about ANGUS to show that it was

A. not as successful as Argo

B. used more often than Argo

C. preferred to Argo during calm weather.

D. not as modern as Argo but still reliable.