H4 Revalidation. what is I-797C and I-797?

[Confused_h1B]

Hi,

I have been reading the old posts and I came across a confusing info( like I-797A for h4).

The documents I should carry ( one of the documents ):


for H1B - I-797A
for H4B - I - 797C


is there anything like I-797(A) for H4B?

and am I right to assume to carry I-797c for my husband as I am carrying I-797A for my h1B?


please can anyone calrify me?

kind regards,
Desi