Which of the following sentences contains NO errors?

a$.$ The allocation of funds to the horoper agencys is an essential step in acquiring the resources that we need.

b$.$ Many software vendors offer products that are either outdated or fail to meet industry standards.

c$.$ A veriety of exemplary training programs are available to help you learn the nuances of the position.

d$.$ Many of our long$-$standing cliants are unreliable when it comes to the practice of record keeping.

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