Which statement is true about the verb estar?

a.
it is an irregular verb.

b.
its yo form follows a regular pattern.

c.
it is a regular verb.

d.
its yo form needs an accent mark.

Which one of the following is the correct rhyme to keep in mind when using the spanish counterparts to this, that, those and these? a: “that” and “those” both have s’s, “this” and “these” don’t b: “that” and “those” both have t’s, “this” and “these” don’t c: “this” and “these” both have s’s, “that” and “those” don’t d: “this” and “these” both have t’s, “that” and “those” don’t