Usage of the expression "job vacancies"

[Kwfine]

Hi,
could you help me check which of the following sentences is the most correct one out of each group:

group A:
1 . there are jobs vacancies available at ABC Company Llimited.
2 . there are job vacancies available at ABC Company Llimited.

group B:
1. for job hunters, they are welcome to apply for any positions at ABC...
2. for job hunters, they are welcome to apply for a position at ABC...
3. for job hunters, they are welcome to apply for all positions at ABC...
4. for jobs hunters, they are welcome to apply for any positions at ABC...
5. for jobs hunters, they are welcome to apply for a position at ABC...
6. for jobs hunters, they are welcome to apply for all positions at ABC...

Group C:
1 . there are job vacancies provided by ABC Company Llimited.
2 . there are job vacancies available at ABC Company Llimited.

Thanks in advance!
kitty
_________________
各位前輩安安, 我是kitty喔!

[Mister Micawber]

.
These are correct:

group A:
2 . there are job vacancies available at ABC Company Llimited.

group B:
1. Job hunters are welcome to apply for all positions at ABC...

Group C:
2. There are jobs available at ABC Company Limited.
.
_________________
Native English teacher at Mister Micawber's

[Kwfine]

Thank you for your help, Mister Micawber!
_________________
各位前輩安安, 我是kitty喔!