. Which of the following equations can represent a triangle [Orissa JEE 2005]

• A. \[|z-1|\,=\,|z-2|\]
• B. \[|z-1|=|z-2|=|z-i|\]
• C. \[|z-1|-|z-2|=2a\]
• D. \[|z-1{{|}^{2}}+|z-2{{|}^{2}}=4\]