Step 1: Understanding Patentability under the Patent Act.
According to the Patent Act, certain methods and processes related to agriculture or horticulture are not patentable, nor are abstract ideas like presentations of information. Additionally, topography of integrated circuits is excluded from patentability under the Act.
Step 2: Explanation of the options.
- (a) A method of agriculture or horticulture: Methods of agriculture and horticulture are specifically excluded from patentability.
- (b) A presentation of information: Abstract ideas and methods related to presenting information are not patentable.
- (c) Topography of integrated circuits: This is also excluded from patentability.
- (d) All of the above: This is the correct answer, as all the options are not patentable under the Patent Act.
Step 3: Conclusion.
Therefore, the correct answer is (d) All of the above.