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Which would be an appropriate method to detect the core promoter regions in a eukaryotic gene?

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Which would be an appropriate method to detect the core promoter regions in a eukaryotic gene?

(a) Footprint

(b) Sequencing

(c) Linker scanning

(d) S1 endonuclease

I got this question in semester exam.

My question is from Transcription in Eukaryotes : Activators and Repressors in chapter Gene Expression : Transcription Prokaryotes of Cytogenetics

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Correct answer is (c) Linker scanning

To explain: In linker scanning method a small segment of the DNA is removed from promoter region and replaced with a random segment to see its effect on the transcription rate. Thus, as absence of promoter would lead to less transcription this method can be used to detect promoter elements.

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