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

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?

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?

C++ Programming: From Problem Analysis to Program Design

8th Edition

ISBN:9781337102087

Author:D. S. Malik

Publisher:D. S. Malik

Chapter7: User-defined Simple Data Types, Namespaces, And The String Type

Section: Chapter Questions

Problem 8PE: Write a program that reads in a line consisting of a students name, Social Security number, user ID,...

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Question

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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