usages of "challenge"

[uktous]

Hi,

I would like to know how to use the word "challenge".

I got some examples of sentences.

I think all 6 usages could be correct, but want to hear some opinios, and discuss

Sentence1:
One of the challeges facing our clients is the high production cost.
Sentence2:
One of the challeges for our clients is the high production cost.
Sentence3:
One of the challeges of our clients is the high production cost.
Sentence4:
One of the challeges facing our clients is to reduce the the production cost.
Sentence5:
One of the challeges for our clients is to reduce the the production cost.
Sentence6:
One of the challeges of our clients is to reduce the the production cost.


Thanks

[Raymott]

Hi,

I would like to know how to use the word "challenge".

I got some examples of sentences.

I think all 6 usages could be correct, but want to hear some opinios, and discuss

Sentence1:
One of the challeges facing our clients is the high production cost.
Sentence2:
One of the challeges for our clients is the high production cost.
Sentence3:
One of the challeges of our clients is the high production cost.
Sentence4:
One of the challeges facing our clients is to reduce the the production cost.
Sentence5:
One of the challeges for our clients is to reduce the the production cost.
Sentence6:
One of the challeges of our clients is to reduce the the production cost.


Thanks

'facing' and 'for' are better than 'of' for these examples.