hich of the following sentences is correctly punctuated? The new office phone which has ten new dial features, will be installed on Tuesday. The new office phone, which has ten new dial features will be installed on Tuesday. The new office phone, which has ten new dial features, will be installed on Tuesday.

The new office phone, which has ten new dial features, will be installed on Tuesday.

Explanation:

The sentence without any punctuation is-

The new office phone which had ten new dial features will be installed on Tuesday.

Now, looking at the sentence, we can first see that the main subject is "the new office phone". And the phrase "which has ten new dial features" adds details to the subject, thus acting as a dependent clause. And lastly, the verb "installed" indicates that the subject is indeed "the phone".

Thus, the newly punctuated sentence will be like this-

The new office phone, which has ten new dial features, will be installed on Tuesday.

The underlined words comprise the dependent clause while the rest of the words without the dependent clause make up the independent clause, making a full meaningful sentence on its own.