Which sentence does not contain any punctuation errors?

a. this is a very reliable model; it requires little or no maintenance.

b. this is a very reliable model it requires little or no maintenance.

c. this is a very reliable model, and requires little or no maintenance.

d. this is a very reliable model and it requires little or no maintenance.

The sentence with no punctuation errors is:

A. This is a very reliable model; it requires little or no maintenance.

Semicolon is used to separate two independent clauses and when sentences convey different ideas. It is also used when sentences present a number of list which is separated by commas.

It could be 1, 2, or 4, depending on the context.1.) they could have had a fight, and she is too humble to say anything further. she wants robert to say something first.2.) maybe he's staring at a computer playing tetris while she's wearing a *really* tight red dress. just sayin' xd3.) is unlikely given that it's only one sentence worth of context long. 4.) it's possible their relationship is more 'mutual hatred' and they tolerate one another.it could be 1, 2, or 4, as long as you can provide sufficient explanation why. remember this as you write!