Which of the following means brief and to the point?

The term that means brief and to the point is "ters." When something is described as terse, it indicates a style of communication that is succinct and devoid of unnecessary elaboration. This quality is particularly valued in situations where clarity and brevity are essential, such as in professional correspondences or instructions. Being terse allows the speaker or writer to convey information effectively and ensures that the audience receives the main message without distraction from superfluous details.

The other terms in the options relate to different concepts. For instance, "superfluous" refers to something that is excessive or unnecessary, which contrasts with the concise nature of being terse. "Transient" denotes something temporary or fleeting, and "sullen" describes a mood that is gloomy or sulky, neither of which align with the idea of being brief and to the point. This makes "ters" the most appropriate choice for the given definition.