Question: Who is the maternal grandmother of Archduke Carl Ludwig Of Austria (1918–2007)?

Knowledge 1: Archduke Carl Ludwig of Austria (1918–2007)
Archduke Carl Ludwig of Austria (Carl Ludwig Maria Franz JosephMichael Gabriel Antonius Robert Stephan Pius Gregor Ignatius Markus d'Aviano; 10 March 1918 – 11 December 2007), also known as Carl Ludwig Habsburg-Lothringen, was the fifth child of Charles I of Austria and Princess Zita of Bourbon-Parma.He was born in Baden bei Wien and died in Brussels. [SEP] Knowledge 2: Zita of Bourbon-Parma
Zita of Bourbon-Parma ("Zita Maria delle Grazie Adelgonda Micaela Raffaela Gabriella Giuseppina Antonia Luisa Agnese"; 9 May 1892 – 14 March 1989) was the wife of Charles, the last monarch of Austria-Hungary.As such, she was the last Empress of Austria and Queen of Hungary, in addition to other titles.Born as the seventeenth child of the dispossessed Robert I, Duke of Parma, and his second wife, Infanta Maria Antonia of Portugal, Zita married the then Archduke Charles of Austria in 1911.Charles became heir presumptive to the Emperor Franz JosephI of Austria in 1914 after the assassination of his uncle Archduke Franz Ferdinand of Austria, and acceded to the throne in 1916 after the old emperor's death.After the end of World War I in 1918, the Habsburgs were deposed and the empire became four independent countries, Austria, Hungary, and the newly formed Czechoslovakia and State of Slovenes, Croats and Serbs.Charles and Zita left for exile in Switzerland and were subsequently removed from Hungary by the Allies to Madeira, where Charles died in 1922.After her husband's death, Zita and her son Otto served as symbols of unity for the exiled dynasty.A devout Catholic, she raised a large family after being widowed at the age of 29, and never remarried.
Knowledge 1: Archduke Carl Ludwig of Austria (1918–2007)
Archduke Carl Ludwig of Austria (Carl Ludwig Maria Franz JosephMichael Gabriel Antonius Robert Stephan Pius Gregor Ignatius Markus d'Aviano; 10 March 1918 – 11 December 2007), also known as Carl Ludwig Habsburg-Lothringen, was the fifth child of Charles I of Austria and Princess Zita of Bourbon-Parma.He was born in Baden bei Wien and died in Brussels. [SEP] Knowledge 2: Archduchess Maria Annunciata of Austria
Archduchess Maria Annunciata of Austria (13 July 1876 – 8 April 1961) was a daughter of Archduke Karl Ludwig of Austria and his third wife, Infanta Maria Theresa of Portugal.She was Princess-Abbess of the Theresian Royal and Imperial Ladies Chapter of the Castle of Prague (1894–1918).
Knowledge 1: Zita of Bourbon-Parma
Zita of Bourbon-Parma ("Zita Maria delle Grazie Adelgonda Micaela Raffaela Gabriella Giuseppina Antonia Luisa Agnese"; 9 May 1892 – 14 March 1989) was the wife of Charles, the last monarch of Austria-Hungary.As such, she was the last Empress of Austria and Queen of Hungary, in addition to other titles.Born as the seventeenth child of the dispossessed Robert I, Duke of Parma, and his second wife, Infanta Maria Antonia of Portugal, Zita married the then Archduke Charles of Austria in 1911.Charles became heir presumptive to the Emperor Franz JosephI of Austria in 1914 after the assassination of his uncle Archduke Franz Ferdinand of Austria, and acceded to the throne in 1916 after the old emperor's death.After the end of World War I in 1918, the Habsburgs were deposed and the empire became four independent countries, Austria, Hungary, and the newly formed Czechoslovakia and State of Slovenes, Croats and Serbs.Charles and Zita left for exile in Switzerland and were subsequently removed from Hungary by the Allies to Madeira, where Charles died in 1922.After her husband's death, Zita and her son Otto served as symbols of unity for the exiled dynasty.A devout Catholic, she raised a large family after being widowed at the age of 29, and never remarried. [SEP] Knowledge 2: Archduchess Maria Annunciata of Austria
Archduchess Maria Annunciata of Austria (13 July 1876 – 8 April 1961) was a daughter of Archduke Karl Ludwig of Austria and his third wife, Infanta Maria Theresa of Portugal.She was Princess-Abbess of the Theresian Royal and Imperial Ladies Chapter of the Castle of Prague (1894–1918).

Answer: Infanta Maria Antonia of Portugal