Answer:
Introns.
Step-by-step explanation:
The RNA transcript consists of the both the exons and the introns region. The exons are the coding region of the RNA that codes for the particular amino acids.
The introns are the interrupted sequences between the exon. These sequences does not code for any proteins but helps in the alternative splicing. The introns are not present in case of prokaryotes.
Thus, the correct answer is option (d).