Determining the Value of z with Data Sufficiency

Medium Data Sufficiency Determining Sufficiency

What is the value of z?

Statement (1): The product of z and 3 equals 21.

Statement (2): z is an integer less than 5.

Statement (1) alone is sufficient, but statement (2) alone is not sufficient.

Statement (2) alone is sufficient, but statement (1) alone is not sufficient.

Both statements together are sufficient, but neither statement alone is sufficient.

Each statement alone is sufficient.

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