I think the best choice is the last one: <span>d. appropriate length.
. Length is also determined by the purpose of the work and the context in which it will appear. (for examples, some newspaper articles have per-specified length). </span>
Yes but what do you mean by online . It can be a sign of a catfish if they dont want to ft . If not then yes a online can be the start of great relationships via: ig, sc, twitter etc