Answer: (ii) At most 3 addresses

Explanation

A three-address code is an intermediate-code statement of the general form:

$$\mathrm{result} = \mathrm{arg}_1\ \text{op}\ \mathrm{arg}_2$$

Each statement contains at most three operands/addresses: the destination plus at most two source operands. The name comes from the fact that a single 3-address statement involves at most three addresses.

• It is not exactly 3 addresses — a statement like t = a or t = -a has fewer than three addresses.
• It can contain a unary operation (e.g. t = -x), so saying "no unary operator" is wrong.
• Therefore "Exactly 3 address" (i), "No unary operator" (iii), and "None" (iv) are incorrect.

The correct statement is:

$$\boxed{\text{(ii) At most 3 addresses}}$$