which of the following will output string below ttttt, C#, .Net Technology

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Question:Which of the following will output the string below?
"ttttt"

A private string Tabs(uint numTabs) { 
IEnumerable<string> tabs = Enumerable.Repeat("t", numTabs); 
return (numTabs > 0) ? tabs.Aggregate((sum, next) => sum + next) : ""; 
} 
B private string Tabs(uint numTabs) { 
StringBuilder sb = new StringBuilder(); 
for (uint i = 0; i <= numTabs; i++) { 
 sb.Append("t"); 
} 
return sb.ToString(); 
} 
C private string Tabs(uint numTabs) { 
string output = ""; 
for (uint i = 0; i <= numTabs; i++) { 
 output += 't'; 
} 
return output; 
} 
D private string Tabs(uint numTabs) { 
 String output = new String('t', numTabs); 
 return output; 
}

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Question:Which of the following will output the string below? "ttttt"

A private string Tabs(uint numTabs) { IEnumerable<string> tabs = Enumerable.Repeat("t", numTabs); return (numTabs > 0) ? tabs.Aggregate((sum, next) => sum + next) : ""; }

B private string Tabs(uint numTabs) { StringBuilder sb = new StringBuilder(); for (uint i = 0; i <= numTabs; i++) { sb.Append("t"); } return sb.ToString(); }

C private string Tabs(uint numTabs) { string output = ""; for (uint i = 0; i <= numTabs; i++) { output += 't'; } return output; }

D private string Tabs(uint numTabs) { String output = new String('t', numTabs); return output; }

D