Which of the following is false?

I. When we have a limited access link rate for an enterprise network $($assuming all other things are the same$),$ installing a web cache might be a cost$-$efficient and even faster solution than increasing the access link capacity of the enterprise network.

II$.$ We may have two types of caching: Web caching and browser caching.

III. In an enterprise network, when we have an access link rate of $10$ Mbps$,$ and the average data rate of enterprise network hosts is $2\mathrm{.}5$ Mbps$,$ then the access link utilization is $4.$

IV$.$ In an enterprise network, when we have an access link rate of $1\mathrm{.}54$ Mbps$,$ and the average data rate of enterprise network hosts is $1\mathrm{.}5$ Mbps$,$ then the access link utilization is $0\mathrm{.}97.$