| (a) | - | either party or his representative in interest may institute a suit to have the instrument rectified; or |
| (b) | - | the plaintiff may, in any suit in which any right arising under the instrument is in issue, claim in his pleading that the instrument be rectified; or |
| (c) | - | a defendant in any such suit as is referred to in clause (b), may, in addition to any other defence open to him, ask for rectification of the instrument. |