Identify the right combination of primary data collection methods from the following: 

(a) Observation

(b) Experimentation

(c) Corporate database

(d) Survey method

Choose the correct option:

1
(a) and (d) only
2
(c) and (d) only
3
(a), (b) and (d) 
4
(a), (b) and (c) only.

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