The following functions are all intended to check whether a string representing a dna sequence contains any characters that are not 'a','c','g','t', 'A', 'C', 'G', or 'T'. At least some of these functions are wrong. Which ones are correct?A)def valid_dna1(dna): for c in dna: if c in 'acgtACGT': return True else: return FalseB)def valid_dna3(dna): for c in dna: flag = c in 'acgtACGT' return flagC) def valid_dna4(dna): for c in dna: if not c in 'acgtACGT': return False return True--------------------------------------------------------------------------------------------------------------------------------------------------------valid_dna1 onlyvalid_dna4 onlyNone of them.valid_dna1, and valid_dna4 only

Answered: The following functions are all…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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The following functions are all intended to check whether a string representing a dna sequence contains any characters that are not 'a','c','g','t', 'A', 'C', 'G', or 'T'. At least some of these functions are wrong. Which ones are correct?

def valid_dna1(dna):
for c in dna:
if c in 'acgtACGT':
return True
else:
return False

def valid_dna3(dna):
for c in dna:
flag = c in 'acgtACGT'
return flag

def valid_dna4(dna):
for c in dna:
if not c in 'acgtACGT':
return False
return True

--------------------------------------------------------------------------------------------------------------------------------------------------------

valid_dna1 only
valid_dna4 only
None of them.
valid_dna1, and valid_dna4 only

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