Explanation:

- Micro credit refers to the provision of small loans to individuals who may not have access to traditional banking services. These loans are typically intended for self-employment and small business development, helping individuals become financially independent.

- Macro credit is not a recognized financial term in relation to small loans for self-employment. Typically, "macro" refers to something large-scale, which is not relevant here.

- "Both a and b" suggests that both options are simultaneously correct, but since "macro credit" is incorrect, this option is also not valid.

- "None of these" would imply that neither micro credit nor macro credit fits, but micro credit is indeed the correct term for small loans for self-employment.

Therefore, the correct answer is option: 2, Micro credit.